"The cathars have taught me many things, but I will never forget the hard, honest work that first callused my hands."

Ambitious Farmhand // Seasoned Cathar

When Ambitious Farmhand enters, you may search your library for a basic Plains card, reveal it, put it into your hand, then shuffle.
Coven — {1}{W}{W}: Transform Ambitious Farmhand. Activate only if you control three or more creatures with different powers.

Innistrad: Double Feature

Innistrad: Midnight Hunt

A creature has different power from another if their powers are different numbers. For example, a 1/1 creature and a 2/1 creature have different powers.

For three creatures to have different powers from one another, each of their powers needs to be different. A 1/1 creature, a 2/1 creature, and another 2/1 creature aren't three creatures with different powers, even though both 2/1 creatures have different power than the 1/1 creature.

Many coven abilities, such as that of Dawnhart Wardens above, are triggered abilities with intervening if clauses. You must control three or more creatures with different powers at the time the ability triggers and at the time the ability tries to resolve. They do not, however, need to be the same set of creatures in both cases.