Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
: Add . Target opponent gains control of this creature. (Activate only as an instant.)

Flying, vigilance
: When target creature other than this creature dies this turn, return that card to the battlefield under your control.

This spell can't be countered.
Flying
Whenever you draw a card, Niv-Mizzet deals 1 damage to any target.
Whenever a player casts an instant or sorcery spell, you draw a card.

Flying
Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)
Whenever this creature attacks for the first time each turn, if it's attacking the player with the most life or tied for most life, untap all attacking creatures. After this phase, there is an additional combat phase.

Flying, lifelink
Whenever The Haunt of Hightower attacks, defending player discards a card.
Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on The Haunt of Hightower.

( can be paid with any two mana or with . This card's mana value is 6.)
Flame Javelin deals 4 damage to any target.

Whenever this enchantment or another nonland permanent you control is put into a graveyard from the battlefield, each opponent sacrifices a permanent of their choice that shares a card type with it.

Flying

Destroy target permanent.

This creature enters with four +1/+1 counters on it.
Remove a +1/+1 counter from this creature: Add .

During each of your turns, you may play a land and cast a permanent spell of each permanent type from your graveyard. (If a card has multiple permanent types, choose one as you play it.)

First strike
: This creature deals 3 damage to target player or planeswalker and 3 damage to up to one target creature that player or that planeswalker's controller controls.
, Exile this card from your graveyard: It deals 3 damage to target player or planeswalker and 3 damage to up to one target creature that player or that planeswalker's controller controls.

Equipped creature gets +6/+6.
Whenever equipped creature attacks, destroy target permanent.
Equip

Lifelink
When this creature enters, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Reach, trample
Forestcycling (, Discard this card: Search your library for a Forest card, reveal it, put it into your hand, then shuffle.)

Destroy all creatures. Each player loses life equal to the number of creatures they controlled that were destroyed this way.

At the beginning of each player's upkeep, that player gains control of this enchantment.
When you gain control of this enchantment from another player, choose a creature you control and an opponent. Flip a coin. If you lose the flip, that opponent gains control of that creature.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Other creatures you control have intimidate.
Whenever Vela or another creature you control leaves the battlefield, each opponent loses 1 life.

This creature attacks each combat if able.
: This creature gets +1/+0 until end of turn. ( can be paid with one mana from a snow source.)

Exile all creatures.

As this artifact enters, choose a creature type.
, , Sacrifice a creature of the chosen type: This artifact deals 3 damage to any target.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

You may sacrifice two Mountains rather than pay this spell's mana cost.
Fireblast deals 4 damage to any target.

Vigilance, reach
All creatures attack each combat if able.
Whenever a creature attacks you or a planeswalker you control, put a +1/+1 counter on Thantis.

: This creature can't be blocked this turn.

+2: During target player's next turn, each creature that player controls attacks if able.
−2: Rowan Kenrith deals 3 damage to each tapped creature target player controls.
−8: Target player gets an emblem with "Whenever you activate an ability that isn't a mana ability, copy it. You may choose new targets for the copy."
Partner with Will Kenrith
Rowan Kenrith can be your commander.

Flying
When Ryusei dies, it deals 5 damage to each creature without flying.

Each creature card in your graveyard has unearth . (: Return the card to the battlefield. The creature gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

: Draw three cards.
: Return Arcanis to its owner's hand.

: This creature gets +1/+0 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)

When this creature dies, create four 1/1 green Insect creature tokens.

Other Snake creatures you control get +2/+2.
Whenever a Snake you control deals combat damage to a player, you may draw a card.

Create two 3/3 green Insect creature tokens. You gain 2 life.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

When this creature enters, you gain 5 life.

Reach
Whenever an opponent casts a spell, create a 1/1 green Insect creature token.