Possibility Storm
Enchantment
Whenever a player casts a spell from their hand, that player exiles it, then exiles cards from the top of their library until they exile a card that shares a card type with it. That player may cast that card without paying its mana cost. Then they put all cards exiled with this enchantment on the bottom of their library in a random order.
Jason Felix
Dragon's Maze (DGM)
• #34Rulings
The original spell is part of the group of exiled cards put on the bottom of the library in a random order. If the exiled card that shared a card type with that card wasn't cast, it's also part of this group.
(wotc • 2013-04-15)
Artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery are card types. Two cards share a card type if they have at least one card type in common.
(wotc • 2013-04-15)
Instant and sorcery cards with miracle allow a player to cast a card immediately upon drawing it. If a player casts a spell this way, the spell is cast from that player's hand. Possibility Storm will trigger.
(wotc • 2013-04-15)
If the spell you cast from exile has X in its mana cost, you must choose 0 as its value.
(wotc • 2013-04-15)
If Possibility Storm's ability doesn't exile the original spell (perhaps because another Possibility Storm already exiled it), you'll still exile cards from the top of your library until you exile a card that shares a card type with it and have the opportunity to cast that spell.
(wotc • 2013-04-15)
If you cast a spell without paying its mana cost, you can't choose to cast it for any alternative costs, such as overload costs. You can pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, you must pay those.
(wotc • 2013-04-15)
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Rulings
The original spell is part of the group of exiled cards put on the bottom of the library in a random order. If the exiled card that shared a card type with that card wasn't cast, it's also part of this group.
(wotc • 2013-04-15)
Artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery are card types. Two cards share a card type if they have at least one card type in common.
(wotc • 2013-04-15)
Instant and sorcery cards with miracle allow a player to cast a card immediately upon drawing it. If a player casts a spell this way, the spell is cast from that player's hand. Possibility Storm will trigger.
(wotc • 2013-04-15)
If the spell you cast from exile has X in its mana cost, you must choose 0 as its value.
(wotc • 2013-04-15)
If Possibility Storm's ability doesn't exile the original spell (perhaps because another Possibility Storm already exiled it), you'll still exile cards from the top of your library until you exile a card that shares a card type with it and have the opportunity to cast that spell.
(wotc • 2013-04-15)
If you cast a spell without paying its mana cost, you can't choose to cast it for any alternative costs, such as overload costs. You can pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, you must pay those.
(wotc • 2013-04-15)