Twinblade Geist // Twinblade Invocation

Double strike on a two-mana 1/1 promises more damage than the body can pay off; the keyword sits inert until something lifts the power above one. Disturb resolves that friction by turning the card into two threats sharing a single slot: a fragile double-striking body up front, and a three-mana Aura recast from the graveyard that hangs the same keyword on a creature already big enough to want it. Twinblade Invocation exiles itself the moment it would hit a graveyard, and that clause is what keeps the trade fair: a disturb permanent gets one return trip and no more, so the double strike cannot bounce between faces forever. This is a tidier illustration of the mechanic than most disturb creatures manage, because the payoff is identical on both sides. Elsewhere the back face reshapes into a differently-purposed Aura or trigger; here the front is a 1/1 with double strike and the back grants double strike to something worth doubling, one effect aimed at two targets with a single guaranteed reuse. The real prize is that you never have to choose at deckbuilding time between a cheap opening play and a late-game finisher: one card covers both windows, at the cost of paying twice and losing the second copy for good once the Aura leaves the battlefield.