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Plus, they can still be put into their owners graveyard if their toughness becomes 0/0 via anything that would give minus counters (-X/-X), such as the infect ability

Value-based abilities

No, the real reason this line was drawn was giving everybody in every random game store an easy way of knowing if a card was too old or not

Master Duel will be free-to-play and features 10,000 cards

Granted, this path and the ones involving tokens lean a lot more in the combo direction than the mana acceleration direction, but its definitely worth noting Carnival of Souls capability of being useful outside unreliable 3-4 card loops in these strategies, as it gets a bad rap Im not convinced it fully deserves when reading about its capabilities elsewhere