Gruul Signet

Changeling (This card is every creature type.) Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature.

2, T: Flip a coin. If you win the flip, sacrifice this artifact and draw three cards.

T: Add CCC. 3, T, Sacrifice this artifact: Draw three cards.

Whenever an opponent casts a spell, Kaervek deals damage equal to that spell's mana value to any target.

Flash When this creature enters, prevent all damage that would be dealt to artifact creatures this turn.

Whenever this creature attacks, each opponent loses 2 life.

Creatures you control have haste. Sacrifice this enchantment: Target creature gets +2/+2 until end of turn.

Create two 1/1 red Goblin creature tokens.