Aviary Mechanic

Exile target creature you control, then return that card to the battlefield under its owner's control. Draw a card.

Flying, vigilance, lifelink

Flying Whenever this creature or another creature you control enters, you get E (an energy counter). Whenever this creature attacks, you may pay EE. If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.

(T: Add B.)

(T: Add R.)

Flying, vigilance, lifelink Fabricate 2 (When this creature enters, put two +1/+1 counters on it or create two 1/1 colorless Servo artifact creature tokens.) Other creatures you control get +1/+1.

Creatures your opponents control enter tapped. Whenever a creature an opponent controls enters, you gain 1 life.

Target creature gets +2/+2 until end of turn. If it's an artifact creature, it gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)