Mana Echoes

{2}{R}{R} · Enchantment

Whenever a creature enters, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it.

Motor: se resuelve a mano

Rulings (3)

Mana Echoes counts the number of creatures that share a type, not how many types they share. For example, if a Human Warrior enters while you control two Humans and two other Human Warriors, you'll add five {C}.
Wizards of the Coast · 2020-08-07
The amount of mana to add is determined only as the triggered ability of Mana Echoes resolves. The ability isn't a mana ability; players may respond to it.
Wizards of the Coast · 2020-08-07
The creature entering the battlefield shares a creature type with itself if it has any creature types, so Mana Echoes usually adds at least {C}.
Wizards of the Coast · 2020-08-07