Ellie and Alan, Paleontologists

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.

Partner with Blue, Loyal Raptor T: Put your choice of a reach, menace, trample, or haste counter on target Dinosaur. Activate only as a sorcery.

Devour 3 (As this creature enters, you may sacrifice any number of creatures. It enters with three times that many +1/+1 counters on it.) Whenever this creature attacks, it deals damage equal to its power to up to one other target creature. Excess damage is dealt to that creature's controller instead.

Imprint — 1, T: Exile target creature card from a graveyard. Activate only as a sorcery. 6: Create a token that's a copy of target creature card exiled with this artifact, except it's a 6/6 green Dinosaur creature with trample. Activate only as a sorcery.

Counter target noncreature spell. Your opponents can't cast noncreature spells this turn.

10BG: Monstrosity 10. This ability costs 1 less to activate for each creature with power 4 or greater your opponents control. (If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, destroy all artifacts and creatures other than this creature.

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.

Imprint — 1, T: Exile target creature card from a graveyard. Activate only as a sorcery. 6: Create a token that's a copy of target creature card exiled with this artifact, except it's a 6/6 green Dinosaur creature with trample. Activate only as a sorcery.