Trap

From MTG Salvation Wiki

Trap as a subtype for Instants introduced in Zendikar.

Traps have an alternative cost should specific events occur. Usually traps have abilities that undo whatever has made their alternative cost possible, e.g. a Trap that was enabled by two lands entering the Battlefield under an opponents control destroys two lands.

[edit] Examples

Whiplash Trap - Instant - Trap If an opponent had two or more creatures enter the battlefield under his or her control this turn, you may pay rather than pay Whiplash Trap’s mana cost. Return two target creatures to their owner's hand.

---

Card types
Groups	Supertypes	Card types	Subtypes
Spell (non-permanent)		Instant	Trap	Arcane
		Sorcery
Permanent	Basic, Legendary, Snow, World	Artifact	Equipment, Fortification, Contraption
		Creature	(...)
		Enchantment	Aura, Shrine
		Land	(...)
		Planeswalker	(...)
Miscellaneous		Tribal	(...)
		Plane	(...)
		Vanguard
Obsolete	Mono, Poly, Continuous	Interrupt, Mana Source