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When you control your Commander, dying artifacts and creatures you control will force your foes to each lose a life

Sure, you can combo it with cards that put extra counters, but if you can dedicate that much resources to one card, you can dedicate those resources to other ones that win you the game on their own, rather than relying on a combination of cards

Hagneia Equip Sahagin Rarity: Common TYPE: Creature SUBTYPE: Merfolk Warrior CMC: 2 Mana cost: USD: $0.10 EUR: 0.04 TIX: 0.03 EDHREC RANK: 17614 (1/3) Whenever you cast a noncreature spell, if at least four mana was spent to cast it, put a +1/+1 counter on this creature and it can't be blocked this turn

Filter lands are a type of land that lets you convert one type of mana into a specific combination of two colors

That said, I like wither's flavor and intention