mcdonald's pokemon cards charizard Pokémon Pack Opening #3 - Box MCDONALDS COLLECTION Card Number Charizard Chase from McDonald's Happy

A card with a splice ability can't be spliced onto itself because the spell is on the stack (and not in your hand) when you reveal the cards you want to splice onto it

"Pokmon Players Cup Frequently Asked Questions (FAQ) | Pokemon.com"

These play boosters represent a carefully considered new system that blends the best aspects of classic draft boosters with modern collecting appeal, reflecting Magic's ongoing influence on the trading card game market and the vibrant secondary market for individual cards

I don't think I've used it in my own Constructed decks since 1997, but it's come up in Limited environments and I always thought it was fine

But TPC has also spent the last year trying to find ways to combat Pokmon's scalping problem