­Crusade + Resolute Paladin

So a classic white weenie pump; and an indestructibility granter. So I'm making a rare white critter-boost spell of some kind.

Huh, crusade stopped getting printed ages ago. Ah, it got replaced with Honor of the Pure is all.

Humm Crovax, Ascendant Hero already exists. Still, I reckon we can do something smaller.

Vigilance is a white abliity; but would cause confusion with "Do they have +1/+1 or not?" - leaving it tapped to signify will help that.

So we'll go with first-strike instead. Which makes it a knight; which is fine. Size it as such.

Cost.. ? Might need to bump to but... nah. This'll do.

Is this niche and exciting enough to be rare? Borderline; apart from affecting a lot of creatures it could go uncommon. Make it a legendary in order to force it to rare. (That does suggest I could make it a mythic - but I can't think what else I'd want to bolt on for that. Maybe 'while ~ untapped white creates get +0/+2' or something?)

I think this is a sensible rare, and is definitely better at rare than at mythic. This kind of effect has been uncommon if it's restricted, normally by creature type - Hamlet Captain, Goblin General, Nagao, Bound by Honor - but the more widely applicable versions were normally rare - Pianna, Nomad Captain and Soltari Champion, although the most recent is Jelenn Sphinx at uncommon. Compared to Pianna and Soltari Champion, Taking off and adding first strike is a fair exchange for only affecting white creatures, so I think this is spot on.