Flying
As Entropic Specter enters the battlefield, choose an opponent.
Entropic Specter's power and toughness are each equal to the number of cards in the chosen player's hand.
Whenever Entropic Specter deals damage to a player, that player discards a card.

: Target spell becomes colorless.
: Target permanent becomes colorless until end of turn.

Mill seven cards. At the beginning of the next end step, exile seven cards from your graveyard.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Fanning the Flames deals X damage to any target.

Fault Line deals X damage to each creature without flying and each player.

Feedback Bolt deals damage to target player or planeswalker equal to the number of artifacts you control.

Firebolt deals 2 damage to any target.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flame Burst deals X damage to any target, where X is 2 plus the number of cards named Flame Burst in all graveyards.

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.)
Flow of Maggots can't be blocked by non-Wall creatures.

Domain — Target creature gets +1/+1 until end of turn for each basic land type among lands you control.

Haste
At the beginning of the end step, return Glitterfang to its owner's hand.

When Goatnapper enters the battlefield, untap target Goat and gain control of it until end of turn. It gains haste until end of turn.

At the beginning of your upkeep, you may flip a coin. If you win the flip, put a fuse counter on Goblin Bomb. If you lose the flip, remove a fuse counter from Goblin Bomb.
Remove five fuse counters from Goblin Bomb and sacrifice it: It deals 20 damage to target player or planeswalker.

, Sacrifice Goblin Digging Team: Destroy target Wall.

: Goblin Dynamo deals 1 damage to any target.
, , Sacrifice Goblin Dynamo: It deals X damage to any target.

As an additional cost to cast this spell, sacrifice a Goblin.
Goblin Grenade deals 5 damage to any target.

Enchant land
As long as enchanted land is a basic Mountain, Goblin creatures get +1/+0.
When Goblin Shrine leaves the battlefield, it deals 1 damage to each Goblin creature.

Sacrifice a Goblin: Target creature gets +1/+1 until end of turn.

: Regenerate Goham Djinn.
Goham Djinn gets -2/-2 as long as black is the most common color among all permanents or is tied for most common.

Guerrilla Tactics deals 2 damage to any target.
When a spell or ability an opponent controls causes you to discard Guerrilla Tactics, Guerrilla Tactics deals 4 damage to any target.