Reprobation

Enchant creature
Enchanted creature loses all abilities and is a Coward creature with base power and toughness 0/1. (It keeps all supertypes but loses all other types and creature types.)

Jumpstart: Historic Horizons

There was a time all craven beasts cowered before Avacyn's divine might.

Modern Horizons

Effects that modify the enchanted creature’s power or toughness (such as the effects of Force of Virtue or Giant Growth) will apply no matter when they started to take effect. The same is true for counters that change the creature’s power or toughness (such as +1/+1 counters).

If a noncreature permanent becomes a creature and is enchanted with Reprobation, it will remain a creature thanks to Reprobation’s effect, even when the original effect that made it a creature expires.

If the enchanted creature gains an ability after Reprobation becomes attached to it, it will keep that ability.

Reprobation overwrites all previous effects that set the enchanted creature’s creature types, card types, power, and/or toughness to specific values. Other effects that set these characteristics to specific values that start to apply after Reprobation becomes attached will overwrite that portion of the effect.

The enchanted creature retains any supertypes it had, such as legendary or snow.