"We shall forever roam."
—Ayli, high priest of the Eternal Pilgrims

Forsaken Monument

Colorless creatures you control get +2/+2.
Whenever you tap a permanent for {C}, add an additional {C}.
Whenever you cast a colorless spell, you gain 2 life.

Modern Horizons 3 Commander

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An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.

Forsaken Monument’s last ability won’t trigger when you play a land.

A land is normally colorless, regardless of what colors of mana that land can produce. If an effect makes a colorless land into a creature without specifying that it becomes a certain color, the land creature gets +2/+2.

If you tap a permanent for more than one {C}, you add only one additional {C}.

You “tap a permanent for {C}” only if you activate a mana ability of that permanent that includes the {T} symbol in its cost, and only if it produces one or more {C} as it resolves.