Weatherseed Elf

Evasion-granting was the Elf's job for exactly one printing's worth of green, and the design here is the lever rather than the body. The trick is that forestwalk piggybacks on a real-world constant: green decks run Forests, and so do their opponents more often than not, which means the tap ability is functionally an unblockable button against most of the table. Point it at the biggest thing you can, and the 1/1 becomes incidental: a recurring evasion outlet rather than a creature you ever attack with. Repeatable landwalk granting is rare precisely because it scales badly against the designer's intent; the cost of holding it in check is leaning on the defender's manabase, so the card swings from dead to backbreaking based entirely on what colors sit across from you. That conditionality is the whole tension. Against a mono-red or mono-black board it does nothing; against a fellow green mage it can end games by itself, turn after turn. The tap symbol is doing quiet work too, gating the grant to once per turn and demanding the Elf survive to keep paying out, which is what stops a one-drop from trivializing every green mirror. It is a piece of design that trusts the metagame to balance it, a bet that Forests are common enough to matter and rare enough not to dominate.