For reference, it also gained cult-like popularity because of the text of the rule that said, It doesn't make much sense in most situations because if you enter the battlefield without copying anyway, you'll die right away because your defense is 0
Gameplay revolves around a Leader card, and the goal is to successfully attack the opponents leader to claim victory
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On the other hand, people who strongly support the substitute technique tend to focus on the instances in which this works well (dual lands) and gloss over the fact that some of the Reserved List cards most important to the Commander format (Wheel of Fortune and Gaea's Cradle) don't have substitutes that are anywhere close to their original
Aristocrats-style Commander decks love everything he offers : sacrifice outlets, card advantage, and inevitability
It works especially well with Starfield Shepherd, as even a single copy could go a long way toward increasing explosive starts