Rowan's Talent
Graft a triggered doubler onto the one card type that already accrues advantage every turn without prompting, and you get a strange engine: enchant a planeswalker, and every loyalty ability you activate resolves twice, the copy free to pick fresh targets. That copy clause is the reason the Aura exists. The dividend it grants the enchanted walker is a new activated ability of its own, a [+1] that hands a creature +2/+0, first strike, and trample, so the walker can defend itself while it ticks upward. But the payoff lives in the doubling. Point it at a planeswalker whose ultimate ends the game and you are one activation from resolving that ultimate twice; point it at a plus that draws or a minus that removes, and every loyalty tick pays out double. The copy inherits the original's restrictions and simply re-aims, so it doubles a loyalty ability's reach, not its nature. The constraint is honest: it sits inert until you have a loyalty ability worth copying, so it wants a walker with plusses that snowball, minuses that answer, or an ultimate reachable faster than a fair game allows. It belongs to a small family of Auras built to reward stacking one enchantment onto one permanent, a structure that only pays when the permanent beneath it was already worth protecting. Spend the tempo on a card you meant to commit to anyway, and trust that doubled loyalty output beats the risk of loading everything onto one removable target.

