Inferno Trap 
Instant — Trap
If you've been dealt damage by two or more creatures this turn, you may pay rather than pay this spell's mana cost.
Inferno Trap deals 4 damage to target creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL