I wanted to know if an opponent casts {Xenagos, the Reveler} can they use the zero ability right after?
I thought you had to wait a turn
Yes they can.
306.5d (http://imtgapp.com/forum/index.php?action=imtg;area=rule;number=306.5d): Each planeswalker has a number of loyalty abilities, which are activated abilities with loyalty symbols in their costs. Loyalty abilities follow special rules: A player may activate a loyalty ability of a permanent he or she controls any time he or she has priority and the stack is empty during a main phase of his or her turn, but only if none of that permanent's loyalty abilities have been activated that turn. See rule 606, "Loyalty Abilities."
Would not the stack be not empty until the next step? So I thought they could not use it in that main step
Quote from: Ibtrickey on April 26, 2014, 11:23:29 AM
Would not the stack be not empty until the next step? So I thought they could not use it in that main step
This just means they follow the same rules as sorcery speed abilities. Once they resolve the stack becomes empty anyway.
But I thought the stack only empties on a new step?
Quote from: Ibtrickey on April 26, 2014, 09:14:43 PM
But I thought the stack only empties on a new step?
The stack is empty when nothing is on it. You can only go on to the next step when the stack is empty, not the other way round.
Okay
No. He has summoning sickness, even though he isn't a creature.
1/24/2013 If Gideon, Champion of Justice becomes a creature the same turn he enters the battlefield, you can't attack with him or use any of his {T} abilities (if he gains any).