Longer term this card has a lot of potential if any low-cost Merlins are released especially in Sapphire, Steel, or Ruby
[spoiler Daemon Core of Chaos] Any battle damage either player takes from a battle involving this card becomes 0
When picking a grading company, focus on essential things: the quality of their slabs, how consistent their grades are, how fast they work, and their overall reputation
You cant sacrifice the pieces of the merged creature under the top card, only the entire mutated creature
However, its worth mentioning that some effect cards can only happen at certain timings of the damage step, which they usually mention explicitly in their descriptions
It also only cost 1 mana to start