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You can only use each effect of "Helmer, Helmsman Fur Hire" once per turn

So instead of following the normal plan of attacking with three Charizard ex, you can take a layered approach: attack with Charizard ex, then Dragapult ex, and finally a Charizard ex again

it loses 600 ATK/DEF, then, you can Special Summon 1 "Borrel" monster from your GY, but banish it during the End Phase, also you cannot Special Summon other monsters or attack directly for the rest of this turn

It has one of the classic spellslinger payoffs: turning spells you cast into a pile of creatures tokens

Also, I can think of a way to use this in Greed One Kill to send multiplying G's to increase the number of draws, but