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If an effect refers to a "[subtype] spell" or "[subtype] card," it refers only to a spell or card that has that subtype. For example, March of the Drowned is a card that benefits Pirates and features Pirates in its illustration, but it isn't a Pirate card.

For the triggered ability that the entering Dinosaur gains, you choose a target when the ability goes on the stack, but you don't choose until that ability resolves whether those creatures fight.

During the turn Cherished Hatchling dies, you may cast any number of Dinosaurs as though they had flash.

You must pay the costs for spells you cast this way. If there's an alternative cost you can pay instead of the mana cost for a Dinosaur spell, you may pay that cost instead.

For the triggered ability that the entering Dinosaur gains, if the target is illegal when it tries to resolve or if the Dinosaur that entered the battlefield has left the battlefield, no creature will deal or be dealt damage.