Cantankerous Keepers — ruling 1

Affinity for Elves reduces only the generic mana in the cost to cast Cantankerous Keepers. The colored mana must still be paid.

Cantankerous Keepers — ruling 2

To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Cantankerous Keepers's first ability). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast that spell was.

Cantankerous Keepers : règles, fonctionnement et interactions (MTG)

Cantankerous Keepers is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Affinity for Elves (This spell costs less to cast for each Elf you control.) When this creature enters, mill four cards, then put all Elf cards from among them into your hand.

How it works : Cantankerous Keepers

Original English text — Wizards of the Coast / Scryfall

#1June 29, 2026· Wizards of the Coast
Affinity for Elves reduces only the generic mana in the cost to cast Cantankerous Keepers. The colored mana must still be paid.
No other card is named in this ruling.
#2June 29, 2026· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Cantankerous Keepers's first ability). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast that spell was.
No other card is named in this ruling.