Jadelight Ranger

One enters-the-battlefield trigger that resolves explore twice is the whole trick, and the variance it generates is the actual design. The card runs a sequence of two reveals against your own library: hit a land and you draw it, miss and you grow a +1/+1 counter while deciding whether the revealed nonland stays on top or goes to the graveyard. The printed 2/1 is a floor, not a description; the same card can arrive as a 2/1 that drew two lands, a 4/3 that drew none, or any point between, and each nonland is a choice between saving next turn's draw or shoveling a dead card into the yard. That range is what made it a green staple wherever it was legal: every copy is a creature, a card-selection engine, and a manabase smoother folded into a single three-drop, with results the player reads and steers rather than a blind gamble. Explore had appeared as a one-shot keyword action on cheaper bodies, but resolving it twice on a creature that wants to attack is what turned incidental value into a deckbuilding keystone. The downside is genuine: a flooded library returns a flooded result, and the small frame means the worst reveals leave you with a fragile 2/1 clutching two lands you did not need. Accept that floor and you buy a ceiling almost nothing else at the cost matches.