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To trigger his unlock missions Achieve 1 Comeback Victory(ies) in Duels against Aigami at level 30 using Yugi Muto (DSOD)

Getting cards that are rare or hard to find

Maybe they wanted to avoid paper copies of complicated reconfigure creatures, since those involve a lot of moving pieces already, but the general Magic populace can handle effects like this

Though this is less of a problem for certain water pokemon in the TCG because they get exponentially more powerful as they gain energy as opposed to most pokemon who only get additively stronger

Not all non-land snow permanents, not all other snow permanents, all snow permanents