Marwyn, the Nurturer Marwyn, the Nurturer can be quite the handy mana dork, and in more decks than youd think
Mana Vault Mana Vault is part of a nasty 2-card combo: Mana Vault plus whatever busted 4- or 5-mana spell you want to play on turn 2 strong enough to be banned in Legacy and even restricted in Vintage
It also rewards control decks and combo decks with the high degree of card selection it offers since control decks need specific answers and combo decks are looking for those final combo pieces
Every burn spell, card draw spell, spot removal, sweeper, stax piece, and mana rock would have a creature type like goblin, wizard, rogue, elf, squirrel, shark, fox, ooze, or ouphe
Moreover, if youre desperate, you can actually cycle Sphinxs Revelation for one less mana, and, more importantly, its miles better at every additional amount of mana (itd be close at six except that the three life is a pretty big deal)