Flying
Whenever this creature deals combat damage to a player or planeswalker, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

When this creature enters, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")
, Sacrifice another creature or artifact: Until end of turn, other creatures you control get +1/+0 and gain menace and haste.

Graft 3 (This creature enters with three +1/+1 counters on it. Whenever another creature enters, you may move a +1/+1 counter from this creature onto it.)
: Target creature with a +1/+1 counter on it gains shroud until end of turn. (It can't be the target of spells or abilities.)

When this creature enters, you may exile another target creature.
When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.

First strike
: This creature gains protection from the color of your choice until end of turn.

Enchant creature
Enchanted creature gets +2/+2 and has ": Regenerate this creature." (The next time the creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Whenever equipped creature attacks, defending player reveals cards from the top of their library until they reveal a land card. The creature gets +1/+0 until end of turn for each card revealed this way. That player puts the revealed cards into their graveyard.
Equip

At the beginning of your end step, if you gained 3 or more life this turn, create a 3/3 white Angel creature token with flying.
, , Exile The Book of Exalted Deeds: Put an enlightened counter on target Angel. It gains "You can't lose the game and your opponents can't win the game." Activate only as a sorcery.

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and has "When this creature dies, you lose 4 life."

Choose two target creature cards in your graveyard. Sacrifice a creature. If you do, return the chosen cards to the battlefield tapped.

Enchant creature
Enchanted creature gets +3/+0 and has first strike. (It deals combat damage before creatures without first strike.)

Menace

Start your engines!
Other Goblins you control have haste.
At the beginning of combat on your turn, create a 1/1 red Goblin creature token. That token attacks this combat if able.
Max speed — : Add for each Goblin you control.

: This creature gets +2/+2 until end of turn. Activate only once each turn.
: Return this creature to its owner's hand.
: This creature gains haste until end of turn.

Put target permanent on top of its owner's library.

Flying
Whenever this creature attacks, another target attacking creature gains flying until end of turn.

Scry 2, then draw two cards. You lose 2 life. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Target creature gets +3/+1 and gains trample until end of turn.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Until end of turn, gain control of target creature and it gains haste. Untap and goad that creature. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Flying, double strike

Defender (This creature can't attack.)

Other Goblin creatures you control get +1/+1.
: Regenerate another target Goblin.

Flying
This creature can't block artifact creatures.

When this creature enters, return target creature an opponent controls to its owner's hand. That creature's owner can't cast spells with the same name as that creature until your next turn.

, : This creature loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay to end this effect.
Enchanted creature can't attack.

Flying
Whenever this creature deals combat damage to a player, you may destroy target artifact or enchantment that player controls.

Flash (You may cast this spell any time you could cast an instant.)

Target creature gets +1/+0 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
Investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")

You may look at the top card of your library any time.
You may play lands from the top of your library.
Coven — As long as you control three or more creatures with different powers, you may cast creature spells from the top of your library.

Kicker (You may pay an additional as you cast this spell.)
Destroy target artifact or enchantment. If this spell was kicked, draw two cards.

As an additional cost to cast this spell, sacrifice a creature.
Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Exile Eldritch Evolution.

As this artifact enters, choose a creature type.
Creature spells of the chosen type cost less to cast.

When this creature enters, you get (three energy counters).
Pay : This creature gets +X/+X until end of turn, where X is its power.

Enrage — Whenever this creature is dealt damage, it deals 2 damage to target opponent or planeswalker.

Search your library for a card, then shuffle and put that card third from the top.

Other Elf creatures get +1/+1 and have forestwalk. (They can't be blocked as long as defending player controls a Forest.)