With prices only increasing in the Pokmon TCG community, it's likely that Illustrator Pikachu will not be the only card that sells at a record-breaking price
The fact that split cards change whether its in your hand, graveyard, or on the stack is important because of how rules consider each spell
This is called the "black core" layer
A small tangent suggests these cards were being signed as early as 2025, and that they can only use characters whose actor was alive to physically sign the card
Omnibian does not remove abilities, but its effect is applied at sublayer 7b, whereas Tarmos effect is applied at 7a
It can be a cantrip, which draws you a card on top of some other small effect, or something as big as Ancestral Recall, which draws you multiple cards for 1 mana