Heretical Phobos Covos - The Infinite Forbidden (INFO)

2 Level 4 monsters
You can target 1 Effect Monster your opponent controls; negate its effects, then if it battled this turn, you can take control of it until the End Phase. This is a Quick Effect if this card has an Illusion monster as material. You can only use this effect of "Heretical Phobos Covos" once per turn. If this card battles a monster, neither can be destroyed by that battle.