Force of Negation [Modern Horizons] Human Merfolk You can only use this

You can only use this effect of "Backup Operator" once per turn

destroy all face-up monsters on the field with a different level than it

Set: Tenth Edition Type: Instant Rarity: Common Cost: {1}{G} Target creature gets +1/+1 until end of turn

Special Summon 1 "Buster Blader" monster from the Deck

make both players send all cards they control to the Graveyard at the end of the 3rd Battle Phase after this card's activation

Force of Negation [Modern Horizons] Human Merfolk You can only use thisSet: Modern Horizons Type: Instant Rarity: Rare Cost: {1}{U}{U} If it's not your turn, you may exile a blue card from your hand rather than pay this spell's mana cost. Counter target noncreature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. "Try, if you must."