To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Water Crystal's first ability)
But what happens when a Magic cards text needs to break through its borders
These cards are not yet revealed in Japan, we assume these cards will be part of the yet unrevealed set S3a Legend's Heartbeats, the set after S3 Infinity Zone
You wont receive combat damage, but youll still exile 20 cards, because nothing prevents the attack trigger from happening
The +2 and +0 abilities are quite strong in decks that love creatures
Moreover, once Valors Flagship attacks and returns to your hand, you can cycle it to repeat the process on your next turn