yugioh card draw cards Pot of Desires and if you do Top 30 Archetype-Specific Draw Spells

You gain life equal to the damage dealt, but not more life than the player's life total before Drain Life dealt damage or the creature's toughness

Xorn: Double the treasure output for double the fun

This might seem like a problem, but Underworld Goddess also has the effect to negate the activation of a card or special summoned monster's effect once per turn

In many cases, having her on the field is essentially game over unless your opponent has abilities that can exile creatures or give them -8/-8 (Avacyn's power and toughness)

It's pretty easy for Hasbro to arrange internal crossovers for Magic and these other IPs