Goblin Assassin

Whenever Goblin Assassin or another Goblin enters the battlefield, each player flips a coin. Each player whose coin comes up tails sacrifices a creature.

Spiketail Drakeling

Flying
Sacrifice Spiketail Drakeling: Counter target spell unless its controller pays .

Necravolver

Kicker and/or (You may pay an additional and/or as you cast this spell.)
If Necravolver was kicked with its kicker, it enters the battlefield with two +1/+1 counters on it and with trample.
If Necravolver was kicked with its kicker, it enters the battlefield with a +1/+1 counter on it and with “Whenever Necravolver deals damage, you gain that much life.”

Grizzly Fate

Create two 2/2 green Bear creature tokens.
Threshold — Create four 2/2 green Bear creature tokens instead if seven or more cards are in your graveyard.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Dromar, the Banisher

Flying
Whenever Dromar, the Banisher deals combat damage to a player, you may pay . If you do, choose a color, then return all creatures of that color to their owners’ hands.

Guerrilla Tactics

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.

Duh

Destroy target creature with reminder text. (Reminder text is any italicized text in parentheses that explains rules you already know.)

Richard Garfield, Ph.D.

You may play cards as though they were other cards of your choice with the same mana cost. You can’t choose the same card twice. (Mana cost includes color.)

Flamewave Invoker

: Flamewave Invoker deals 5 damage to target player or planeswalker.

Fireball

This spell costs more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Guided Strike

Target creature gets +1/+0 and gains first strike until end of turn.
Draw a card.

Recoup

Target sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (Mana cost includes color.)
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Rune Snag

Counter target spell unless its controller pays plus an additional for each card named Rune Snag in each graveyard.

Brightflame

Radiance — Brightflame deals X damage to target creature and each other creature that shares a color with it. You gain life equal to the damage dealt this way.

Flamewave Invoker

: Flamewave Invoker deals 5 damage to target player or planeswalker.

Fireball

This spell costs more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Cephalid Broker

: Target player draws two cards, then discards two cards.

Guided Strike

Target creature gets +1/+0 and gains first strike until end of turn.
Draw a card.

Timberwatch Elf

: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

Timberwatch Elf

: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

Flamewave Invoker

: Flamewave Invoker deals 5 damage to target player or planeswalker.

Fireball

This spell costs more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Flamewave Invoker

: Flamewave Invoker deals 5 damage to target player or planeswalker.

Timberwatch Elf

: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.