"Frenzy", the Chaotic

: Goblins you control have "Whenever this creature attacks, it gets +1/+0 for each other attacking goblin."
+1: Flip a coin. If heads, create a 1/1 red Goblin creature token. If tails, sacrifice a creature, "Frenzy" deals 1 damage to any target.
-5: Create 5 1/1 red Goblin creature tokens, until end of turn, goblins you control have haste and Double strike.