1999 kadabra pokemon card value Is a worth anything? : r/PokemonCardValue Kadabra 32/102 -Pokemon Card -Base

The damage of the attack used by the opponent's Pokmon that received this attack during their next turn becomes "-30"

Fuse reads "You may cast one or both halves of this card from your hand" so you are treating them both as separate spells, so anything that modifies the cost of spells would modify each half

These are often used when a player does not own a particular card but wants to test it in their deck or when they want to practice for a tournament without risking damage to valuable cards

Legacy even has a deck simply called Lands (which plays some of the cards on this list) that aims to win with this combo piece

If youre looking for a set thats already pretty valuable, then Ruler of the Black Flame is one of the best options to jump into and keep in storage for the next couple of years