Im going to start by slotting Bonecrusher Giant in for Tarfire to see if the Shock attached to a reasonably costed body is worth it
So you can cast the instant or sorcery, and then the card goes on an Adventure into exile, from where you can later cast the creature spell
Where To Buy You can usually get Secret Lairs directly from the Wizards' website when they release, but the sales window is time-sensitive
They mutate into the creature on top plus all abilities from under it.) Trample You may cast this card from your graveyard using its mutate ability
Either way, you cant go wrong with a playset of the Mythic Dragon for Standard with overlap for Pioneer and Commander
Rona, Disciple of Gix Rona, Disciple of Gix kind of like a Snapcaster Mage for nonland historic cards, which is alright