Xalanor, Veiled Betrayer

Ward {2}
Opponents cannot gain life or activate abilities of creatures they control unless they sacrifice a nonland permanent.
Whenever a creature you control dies, you may pay {1}{u}. If you do, create a 2/2 blue Crystal Golem token with "When this creature dies, draw a card."
{1}{u}{b}{t}Gain control of target creature with mana value 4 or less until end of turn. Untap that creature. It gains haste.

"Each crystal echoes their last cry, reflecting not you, but what you fear most" - Xalanor,