Kogragug, Jund's Prodigy

: Whenever you sacrifice a creature, you may discard a card. If you do, target opponent discards a card.
+1: Create a 2/1 red goblin creature token with "Sacrifice this creature: Each player draws a card and loses 1 life.
-3: Target creature you control gets +5+5 and gains haste, trample and vigilance. Sacrifice it at the beginning of the next end step.