Wratheart, frost lich lord

Partner with magmos, molten lich Lord
(when this card comes into play, target
player searches their library for a card named
magmos, molten lich Lord.)
Sacrifice a blue or black creature, put X +1/+1 counters on
wratheart, frost lich lord, where x is the sacrificed 's converted mana cost
{t}{u}{b}{u/b} tap target creature, it doesn't until during its control's until step