Niveous Wisps

The cantripping Wisps were a small but durable lineage: a one-mana white instant that taps a creature, replaces itself with a card, and recolors its target on the way through. The color-change clause looks like flavor filler and isn't. Turning a creature white sets up protection effects, lets a white-matters trigger fire, or strips a green or blue creature of the color a protection-from spell needs to bite. But the workhorse use is the tap line at instant speed: it answers a would-be attacker before combat math resolves, takes an untapped blocker off the table on your own swing, or breaks a creature out of a defensive crouch. The catch is that none of it sticks. The tap simply holds until the target's controller reaches their untap step, and the white coat fades at end of turn; you are renting a tempo swing, not buying one. What holds the design up is that it never costs you a card to do its work. Most pseudo-Falter or pseudo-removal effects of this weight ask you to trade down on cards for a single turn of tempo; the cantrip means you spend mana, not resources, and your hand stays even. That is the structural reason effects like this keep getting reprinted in low-power environments: a one-mana trick that always replaces itself can be jammed into a deck without diluting its card quality, and the color-matters and tap-down upside is pure gravy on a card that was already paying for itself.