If one does, its controller puts it on the stack and chooses targets for it, if any. 6/7/2013: Split second doesn’t prevent triggered abilities from triggering. Split Second is a keyword ability. Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) The core of the change is that we're no longer assuming split cards have two sets of characteristics when they're not on the stack. When a spell or ability an opponent controls causes you to discard Quagnoth, return it to your hand. Some characteristics have multiple pieces of information very naturally—Destined to Lead is an instant sorcery, the same as Ornithopter is an artifact creature. Details It is a mechanic from the Time Spiral Block that states; "While this spell is on the stack, players can't play spells or activated abilities that aren't mana abilities". 702.60a Split second is a static ability that functions only while the spell with split second is on the stack. Those abilities will resolve as normal. “Split second” means “As long as this spell is on the stack, players can’t cast other spells or activate abilities that aren’t mana abilities.” Split second doesn’t prevent players from activating mana abilities. “Conspire” means “As an additional cost to cast this spell, you may tap two untapped creatures you control that each share a color with it” and “When you cast this spell, if its conspire cost was paid, copy it. The second is a triggered ability that functions while the spell with conspire is on the stack. This gives the caster a good tactical advantage, meaning that the spell mostly cannot be countered or responded to. Shroud (This creature can't be the target of spells or abilities.)