prototype mtg cards Magic The Gathering - Kamigawa - Neon Dynasty put a +1/+1 counter on Myr Prototype. mtg prototype cards in MTG:

If an effect instructs you to create a token and then do something to "it", replacement effects like Doubling Season change that "it" to mean "each token created this way," not just the first one

Wulfgar of Icewind Dale #56 Adventures in the Forgotten Realms Commander Change Version Wulfgar of Icewind Dale Legendary Creature Human Barbarian Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.) If a creature you control attacking would cause a triggered ability of a permanent you control to trigger, that ability triggers an additional time

It also really helps ensure that you know what cards we have our eyes on so cards wont feel like theyre banned out of nowhere in the future, Verhey wrote in the blog post announcing the system at the time

It can't be recast

Each deck is designed to be played against other 60-card Theme Decks

That was the Multiverse Legends subseries, which will appear with the set and associated Secret Lairs