mtg first cards Avatar the Last Airbender Then shuffle MTG Unlimited - Third Print

And even before Cranial Extraction, there were cards like Eradicate, Lobotomy, and Jester's Cap

[7] However, they were the first to introduce Pokmon SP (special Pokmon), which refer to a trainers Pokmon

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Demon Wall Rarity: Uncommon TYPE: Artifact Creature SUBTYPE: Demon Wall CMC: 2 Mana cost: USD: $0.23 EUR: 0.15 TIX: 0.03 EDHREC RANK: 16042 (3/3) Defender Menace (This creature can't be blocked except by two or more creatures.) As long as this creature has a counter on it, it can attack as though it didn't have defender

That last keyword isnt seen much now, but it means that when it attacks the defending player has to sacrifice six permanents