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This is going to be a pain to block all game long, and that goes really well alongside Toxic

You can be more liberal with it if you have an ally with healing like Vincent Lee or put more sources of healing in the deck, but I find that these are very inefficient uses of deck slots and action economy

What Happens if a Menace Creature Gains an Ability Like Cant Be Blocked

There were no deck limits in those days, and no limit to how many of a single card you could include in a deck

Mishra's Workshop created effects that in modern terms were even more obscene, letting you drop cards that cost six mana on turn two without spending any cards