Goblin Oracle

Whenever you attack with 3 or more creatures,
you may flip a coin. If heads, all attacking
creatures gain +1 +1 until end of turn.
If tails, all creatures lose -1 -1 until end of turn.
During your upkeep, you may flip a coin.
If heads, the creature you control with the most
power gains +1 +1. If tails, all cards cost
{1} more to cast until the beginning of your next
turn.