Talk:Stallion of the Divine King, Sleipnir/@comment-25835828-20150607014110/@comment-5777478-20150607031119

Yes you can call him in response to an impact. No it will not negate the impact since the conditions of the impact have already been met by the time you counter.

What you can do (though this is very time sensitive) is call him the instant your oppontent enters final phase, but before they cast the impact. Once they cast it (pay the cost) its too late to block them. When playing a friendly game, this is dificult to do. In an official tournament, the rules are on your side. By the rules, a player can NOT skip a phase. Move can be used to block Gargantua this way. By the rules, a player must call the phase. In friendly competitions, players often skip these declarations to make the game faster. In a tournament, if they skip the declaration, you simply tell them you're calling Sleipnir as they enter final phase. By the rules, they're suppose to call the phase so if they skip that, they have to allow you the redo. If they call the phase, and give you a few seconds to act and you do nothing, until after they cast the impact, that's your fault not theirs.