A card, spell, or permanent is a Myr only if it has the subtype Myr, regardless of its name. For example, Myr Reservoir itself is not a Myr.
2011-01-01 · Wizards of the Coast
You can use the mana produced by Myr Reservoir’s first ability to pay an alternative cost or additional cost incurred while casting a Myr spell. It’s not limited to just that spell’s mana cost.
2011-01-01 · Wizards of the Coast
The mana can’t be spent to activate activated abilities of Myr sources that aren’t on the battlefield.
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Red Riot Games · Condition LP
