As an additional cost to
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) this spell, you may
waterbend“Waterbend [cost]” means “Pay [cost]. For each generic mana in that cost, you may tap an untapped artifact or creature you control rather than pay that mana.”
If a waterbend cost is part of the total cost to cast a spell or activate an ability (usually because the waterbend cost itself is an additional cost), the alternate method to pay for mana described in rule 701.67a may be used only to pay for the amount of generic mana in the waterbend cost, even if the total cost to cast that spell or activate that ability includes other generic mana components.
An ability that triggers whenever a player waterbends triggers whenever that player pays a waterbend cost, regardless of how they paid that cost. (CR 701.67) . (While paying a
waterbend“Waterbend [cost]” means “Pay [cost]. For each generic mana in that cost, you may tap an untapped artifact or creature you control rather than pay that mana.”
If a waterbend cost is part of the total cost to cast a spell or activate an ability (usually because the waterbend cost itself is an additional cost), the alternate method to pay for mana described in rule 701.67a may be used only to pay for the amount of generic mana in the waterbend cost, even if the total cost to cast that spell or activate that ability includes other generic mana components.
An ability that triggers whenever a player waterbends triggers whenever that player pays a waterbend cost, regardless of how they paid that cost. (CR 701.67) cost, you can
tapTo tap a permanent, turn it sideways from an upright position. Only untapped permanents can be tapped. (CR 701.26) your artifacts and creatures to help. Each one pays for
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Draw two cards. If this spell's additional cost was paid, instead
shuffleTo shuffle a library or a face-down pile of cards, randomize the cards within it so that no player knows their order.
Some effects cause a player to search a library for a card or cards, shuffle that library, then put some or all of the found cards into a different zone or in a certain position in that library. In such cases, the found cards aren’t included in the shuffle, even though they remain in the library at that time. Rather, all the cards in that library except those are shuffled. Abilities that trigger when a library is shuffled will still trigger. See also rule 401, “Library.”
If an effect would cause a player to shuffle one or more specific objects into a library, that library is shuffled even if none of those objects are in the zone they’re expected to be in or an effect causes all of those objects to be moved to another zone or remain in their current zone.
If an effect would cause a player to shuffle a set of objects into a library, that library is shuffled even if there are no objects in that set.
If an effect causes a player to shuffle a library containing zero or one cards, abilities that trigger when a library is shuffled will still trigger.
If two or more effects cause a library to be shuffled multiple times simultaneously, abilities that trigger when that library is shuffled will trigger that many times.
If an effect would cause a player to shuffle a library at the same time that an object would be put into a certain position in that library, the result is a shuffled library that’s randomized except that the object is in the specified position. (CR 701.24) your graveyard into your library, draw seven cards, and you have no maximum hand size for the rest of the game.
ExileTo exile an object, move it to the exile zone from wherever it is. See rule 406, “Exile.” (CR 701.13) Spirit Water Revival.