Hope Tender

Land untappers have always lived in the same niche, descended from Kiora's Follower and its kin: a body that doubles your access to a single land, the obvious application being a land whose tap ability scales, a Gaea's Cradle or a Cabal Coffers, anything worth firing twice in a turn. What separates this one is the exert clause, the keyword that turns a creature's downside into a second gear. The base mode costs a mana to untap one land, so on an ordinary Forest it nets nothing; the math only pays off when the land you untap produces more than one mana, at which point you are doubling a single big producer. Exert instead and you untap two lands, at the price of the creature sitting out your next untap step. That gives you two modes without any modal text: a one-for-one boost to a single high-output land most turns, or a wider untap that touches two lands when the lockout is worth eating. The exertion timer is what stops the bigger mode from repeating: every exert costs you the following turn's activation, so two-land untaps cannot come every turn. And because the bigger mode still taps the creature, exert is folded into an activated ability rather than paid to attack; this druid stays home working your mana instead of swinging. Deploying at two mana off a single green source, it costs nothing to run and rewards decks built around one land worth squeezing.