Arbor Elf

Most one-mana ramp dorks tap for a color and stop there; this one untaps a Forest instead, and that single substitution is what lets it outscale its peers. Tapping a creature for green produces one mana. Untapping a Forest produces however much that land makes once you have already spent it, so in a deck running Utopia Sprawl, Wild Growth, or any aura that boosts a single land's output, the Elf points at a two-, three-, or four-mana accelerant the turn after it can untap and tap (no haste, so the loop waits until your next turn). The value lives entirely in that exchange: spend the Forest for mana, then unspend it. The targeting clause is broader than it looks. Any nonbasic carrying the Forest type (a Breeding Pool, a Temple Garden, a Stomping Ground) is a legal target, so the real constraint is less basics-versus-duals than whether the manabase contains green-producing lands worth untapping twice. The lineage runs back to Llanowar Elves, but the design solves a different problem: rather than adding a fixed point of mana, it multiplies whatever the targeted land already produces. The 1/1 body is incidental. This is a force multiplier wearing a creature's clothes, only as good as the land it points at.