Enchantment
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→ Counter all spells players cast from their hands, Lock
→ Opponents can't cast spells, Lock
→ Counter all spells players cast from their hands, Lock
→ Lock, Players can't cast spells from their hand
→ Players can't cast spells from their hand, Lock
→ Exile all noncreature spells players cast from their hand, Players can only cast one noncreature spell per turn, Lock
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.
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.
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.
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.
If the spell you cast from exile has X in its mana cost, you must choose 0 as its value.
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.