Manifold Mouse

At the beginning of combat on your turn, target Mouse you control gains your choice of double strike or trample until end of turn.
(This token's mana cost is {1}{R}.)

Bloomburrow

Offspring {2} (You may pay an additional {2} as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.)
At the beginning of combat on your turn, target Mouse you control gains your choice of double strike or trample until end of turn.

Offspring {2}
At the beginning of combat on your turn, target Mouse you control gains your choice of double strike or trample until end of turn.