yugioh zexal legendary deck Yugi's Decks | 2021 Reprint | New & Sealed | Exodia & God Cards eyed black dragon. Best Sets From The Zexal

One of the rarest and most valuable is the first edition Base Set Charizard

Its always on, and if a creature with toxic deals damage then the poison counters are inflicted without a trigger and without using the stack

It's also a Lightning Type Pokemon, for those times your opponent's Pokemon are weak to lightning

You can also wildly inflate your creature count based on the number of creatures attacking you, thanks to Arachnogenesis

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Recent errata have made this distinction much easier to spot, but previously the cards had to be understood by the rather specific differences between their various activation timings