Shuttle Ace

Not legal in this format after release.

Not legal in this format after release.

A five-mana attacker with no immediate value is far below Modern's required rate; attacking for 4 and gaining 2 is not a credible payoff.

Could be wrong if A newly enabled cheap tapping or Vehicle shell could make its tap trigger more useful.

Five mana for a removal-vulnerable 4/4 with only combat-based life gain is far too slow and low-impact for Legacy.

Could be wrong if Unrevealed repeatable tap enablers could provide a niche, though the mana cost remains prohibitive.

It has a respectable Limited-style combat body, but Pauper five-drops need stronger card advantage or immediate impact than 4 damage and 2 life.

Could be wrong if A slow white shell or abundant tap synergies could make the repeatable life trigger matter.

It can repeatedly gain 2 while attacking, but five mana for a vanilla-sized creature offers little multiplayer value and is highly replaceable.

Could be wrong if A commander that specifically rewards creatures becoming tapped or small life-gain events could improve it.

A 4/4 that attacks as a flyer and gains 2 life generally stabilizes races well, though losing flying on defense limits its ceiling.

Could be wrong if Unknown format speed, removal, and archetypes could make five mana too slow or elevate tap synergies.