If the target creature or planeswalker is an illegal target when Pyretic Rebirth tries to resolve, you'll still return the target artifact or creature card from your graveyard to your hand
I would also recommend having a supporter/trainer card in your deck that allows you to move more than 1 energy card to a Pokemon per turn that way you could use Rayquaza's move every turn and knock out every Pokemon out there in two turns
For big legendary creatures, Im throwing in Aurelia, the WarleaderAurelia, the Warleader, Gisela, Blade of GoldnightGisela, Blade of Goldnight, and Elesh Norn, Grand CenobiteElesh Norn, Grand Cenobite
If youre considering an artifact deck in black, then Battle at the Bridge is a wonderful addition
Kiora $0.98 Born of the Gods Tokens $1.46 Found Your Next Staple
Its also worth noting that this is a budget deck by most standards