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Aug 6, 2012 -- 2:07AM, alextfish wrote:

Following on from Merestil_Hayes' point, I wonder if there might be a difference between the Rooftop Storm and Omniscience wordings in the case of forced casting. At the moment the only cards that can force casting of a spell also say "without paying its mana cost" ( Wild Evocation , Spelltwine , Omen Machine ) or also let you force the means of casting ( Word of Command ), but if there were another such card saying something like:

At the beginning of each player's upkeep, that player reveals a card from his or her hand at random. That player casts that card if able.

then it could force the Omniscient player to cast a detrimental spell ( Akroma's Vengeance ?) but not the Rooftop Storm player (say Crib Swap when all the opponents' creatures have prot white).

Omen Machine forces you to pay the additional cost of Fling , so if you could cast a spell for , you would be forced to pay it.