Each time you cast Vishgraz, youll get three 1/1 colorless Phyrexian Mite tokens, each with toxic 1
Like creatures, you can cast an artifact as a spell during your main phase, and it remains on the battlefield unless its destroyed, sacrificed, exiled, or otherwise removed
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Gavi lets you pay zero instead of the cost of the first card you cycle on a turn, and then whenever you draw your second card for the turn, you create a 2/2 Dinosaur Cat creature token
Could still be good, it just doesn't make me super excited to play, which is where I think you want the custom cards to be
One of the strongest examples of this is Jeska's Will, which can add red mana equal to the cards in a target opponent's hand, and exile cards off the top of your library to play them this turn