Blue, Loyal Raptor

Destroy all tapped creatures. Until your next turn, whenever a creature becomes tapped, destroy it.

Emerge 6U (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) When this creature enters, if you cast it, return each non-Dinosaur creature to its owner's hand.

Whenever this creature enters or attacks, put a -1/-1 counter on up to one target creature. Creatures your opponents control with -1/-1 counters on them can't block.

First strike Dinosaur spells you cast have prowl 2R. (You may cast a spell for its prowl cost if you dealt combat damage to a player this turn with a creature with any of its creature types.)

Whenever a nontoken creature you control with power 4 or greater enters, populate. (Create a token that's a copy of a creature token you control.)

As an additional cost to cast this spell, sacrifice a creature with power 4 or greater. Search your library for a Dinosaur creature card, put it onto the battlefield, then shuffle. It gains indestructible until your next turn.

(As this Saga enters and after your draw step, add a lore counter.) I — For each opponent, up to one target noncreature artifact they control becomes a 0/4 Wall artifact creature with defender for as long as you control this Saga. II — Create a 3/3 green Dinosaur creature token with trample. It gains haste until end of turn. III — Destroy all Walls. Exile this Saga, then return it to the battlefield transformed under your control.

At the beginning of your end step, if a creature died this turn, create a tapped token that's a copy of this creature.