Heres an oddball approach: Creatures (27) 4 Reflector Mage 4 Eldrazi Displacer 4 Pious Evangel 2 Altered Ego 4 Cataclysmic Gearhulk 4 Wispweaver Angel 4 Servant of the Conduit 1 Ninth Bridge Patrol Lands (26) Spells (8) Reveal two Wispweaver Angels and then blink one to loop an arbitrary number of times, gaining as much life as you want with Pious Evangel
0 Cheer Up Attach an Energy card from your hand to 1 of your Pokmon
Carrion Feeder and Viscera Seer are two great examples that can also be returned with Shireis ability, though more resilient sacrifice outlets like Altar of Dementia or Ashnods Altar will work perfectly fine here, too
They can really take off, however, with some help from special creatures like Bartz And Boko, Sazh Katzroy, and Traveling Chocobo (not the super-expensive serialized version)
3 Grass Healing Power And Energy Blasts One type that has seen immediate improvement is the Grass-type
If you don't want it to go off, you have a full turn to destroy it