Incantesimo
Ogniqualvolta una creatura entra in gioco, puoi aggiungere

alla tua riserva di mana per ogni creatura che controlli che abbia almeno un tipo di creatura in comune con essa.
The creature entering the battlefield shares a creature type with itself if it has any creature types, so Mana Echoes usually adds at least
.
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
.
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.