rainbow dragon yugioh card TAEV-EN006 Effect Monster Incorrect Art Misprint! - - - This is of the Super Rare rarity. Rainbow Overdragon | Card Details

(Its not actually infinite infinite because if you use Rals ultimate and fail all five flips you cant keep untap the Veil, but at least you get infinite Planeswalker loyalty.) It will be popular in some EDH decks and in casual circles, but I have real trouble imagining this being good enough in any other format

Mega Charizard Y ex (Crimson Blaze) is not available in Regular Packs

These include the Ultimate Rare version from Light of Destruction as well as the Gold Rare cards from Gold Series 2010 and The Gold Box

animated series, printed for the very first time, and high-demand cards used in current competition

So this being sorcery speed outside of blink decks does tend to limit it slightly, but even then its a powerful option to include