Sheix, Traveling Dragon

+1: Make 2 2/2 dragon whelp tokens with flying and haste, sacrifice them on the next end step.
-3: Put 1 +1/+1 counters on target creature you control, draw a card and deal 3 damage to target player or planeswalker.
-10: Destroy all creatures, then make a 2/2 dragon whelp token with flying and haste for each creature destroyed this way.