Conspiracy: Take the Crown

Custodi Soulcaller

Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked with a creature this combat.)
Whenever Custodi Soulcaller attacks, return target creature card with converted mana cost X or less from your graveyard to the battlefield, where X is the number of players you attacked with a creature this combat.

Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
Whenever Custodi Soulcaller attacks, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the number of players you attacked this combat.