mtg are tokens creature cards o:"tokens you control" · Scryfall Magic: The Gathering Search plus the number of cards with flashback you own in exile. Would I get loads of

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It doesn't trigger if you put Cresting Mosasaurus onto the battlefield without casting it

At the end of each turn they die

Effects that add or remove counters affect Battles' defense counters

Conclusion Let's immediately open the floor to you, dear readers