Tiamat

Flash, Flying, Trample, Indestructible, Shroud
Tiamat enters play with X +1/+1 counters.
When Tiamat enters play, you may: deal X
damage to any target; counter target spell with a
converted mana cost X or less; return target
creature card from a graveyard with a converted
mana cost X or less to the battlefield under your control; gain X life; search your library for an enchantment with converted mana cost X or less,
put it into play, and shuffle your library.