It allows you to avoid sacrificing your treasure tokens to get their mana
For a while, Pioneer has been considered to have a very wide and open metagame with a variety of strong decks able to succeed at competitive events
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Equip variants or equip abilities with restrictions, like the "equip legendary creature" ability of Wrecking Ball Arm, are still equip abilities, and their costs will be reduced by Helitrooper's last ability
No matter the format youre playing, you need to have some interaction, and cards like Swords to Plowshares, Path to Exile, and Farewell rank high among the best tools to solve problems
Any 1-mana elf becomes mana neutral with this in play since Marwyn taps for extra mana