Wither Skeleton

Haste
When Wither Skeleton enters the battlefield, you
may pay {2} any number of times. When you
pay this cost one or more times, put that many
+1/+1 counters on Wither Skeleton, then exile
up to that many instant and/or sorcery cards
with mana value 3 or less from your graveyard
and copy them. You may cast any number of the
copies without paying their mana costs.