Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's converted mana cost. You may cast a spell with converted mana cost X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order.
The converted mana cost of a split card, such as cards with aftermath from the Amonkhet block, is based on the combined mana cost of its two halves. The converted mana cost of the resulting spell is based only on the half you cast.
The ability of Sunbirdâ€™s Invocation resolves before the spell that caused it to trigger. It will resolve even if that spell is countered. If you cast a spell as part of the resolution of the ability, that spell resolves before the spell that caused the ability to trigger.
If you cast one of the revealed cards, you do so as part of the resolution of the triggered ability. You canâ€™t wait to cast it later in the turn. Timing permissions based on the cardâ€™s type are ignored, but other restrictions (such as â€œCast [this card] only during combatâ€) are not.
If you cast a card â€œwithout paying its mana cost,â€ you canâ€™t pay any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Costly Plunder, those must be paid to cast the card.
If the spellâ€™s converted mana cost is 0, you do nothing as the ability of Sunbirdâ€™s Invocation resolves.
If a revealed card in your library has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
For spells with in their mana costs, use the value chosen for X to determine the spellâ€™s converted mana cost.
Casting Sunbirdâ€™s Invocation wonâ€™t cause its own ability to trigger.
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