Whenever this creature attacks and isn't blocked, you may have it deal damage equal to its power to target creature. If you do, this creature assigns no combat damage this turn.

Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn.

When this creature enters, destroy target artifact.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then destroy each artifact with mana value less than or equal to the number of rust counters on it. Artifacts destroyed this way can't be regenerated.
When this enchantment leaves the battlefield, remove all rust counters from all permanents.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Whenever this creature attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)

Flying
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
Whenever this creature phases in, target creature phases out. (It phases in before its controller untaps during their next untap step.)

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
: Each creature without flanking blocking this creature gets -1/-1 until end of turn. Activate only once each turn.

Haste
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

Return two target creatures to their owners' hands.

When this creature enters, return target creature to its owner's hand.

Flying
This creature can block only creatures with flying.

At the beginning of your upkeep, for each land target player controls in excess of the number you control, choose a land that player controls, then the chosen permanents phase out. Repeat this process for artifacts and creatures. (While they're phased out, they're treated as though they don't exist. They phase in before that player untaps during their next untap step.)

Flying, vigilance

Flying
: If the top card of target player's graveyard is a creature card, put that card on top of that player's library.

You may cast this spell as though it had flash. If you cast it any time a sorcery couldn't have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step.
When this enchantment enters, if it's on the battlefield, it becomes an Aura with "enchant creature put onto the battlefield with Necromancy." Put target creature card from a graveyard onto the battlefield under your control and attach this enchantment to it. When this enchantment leaves the battlefield, that creature's controller sacrifices it.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
When this creature enters, you may pay . If you don't, destroy target Knight and it can't be regenerated.

At the beginning of each end step, each player who tapped a land for mana this turn sacrifices a land of their choice. This enchantment deals 2 damage to each player who sacrificed a Plains this way.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
: This creature phases out. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Blue creatures can't block creatures you control.
Nonblue creatures can't block creatures you control unless their controller pays 1 life for each blocking creature they control.

, Sacrifice this creature: Target opponent discards a card at random. Activate only as a sorcery.

Creatures you control get +1/+1 until end of turn.

, Sacrifice a land: Destroy target land.

Destroy all creatures with power 4 or greater. They can't be regenerated.

, : Target land becomes a 2/2 green creature that's still a land. (This effect lasts indefinitely.)

Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)
Creatures with flying can't attack or block, and their activated abilities with in their costs can't be activated.

: This creature deals X damage to each creature and each player. Spend only black mana on X.

When this creature becomes the target of a spell or ability, sacrifice it.

, : Target creature you control gets +2/+2 until end of turn. Return it to its owner's hand at the beginning of the next end step. (Return it only if it's on the battlefield.)

Target opponent reveals their hand. You choose a card from it. That player discards that card.

As an additional cost to cast this spell, sacrifice all permanents you control and discard your hand.
Target player loses 5 life.

: Counter target spell unless its controller pays and 1 life.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
: The next 1 damage that would be dealt to this creature this turn is dealt to any target instead.

Exile the top three cards of your library face down. You may look at those cards for as long as they remain exiled. Until your next turn, you may play those cards. At the beginning of your next upkeep, put any of those cards you didn't play into your graveyard.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Attacking creatures with flying get -2/-2 and lose flying until end of turn.