Tyrite Sanctum

{T}: Add {C}.
{2}, {T}: Target legendary creature becomes a God in addition to its other types. Put a +1/+1 counter on it.
{4}, {T}, Sacrifice Tyrite Sanctum: Put an indestructible counter on target God.

Commander Masters

Dominaria United Commander

Magic Online Promos

Kaldheim Promos

Kaldheim

An indestructible counter on a permanent gives that permanent indestructible.

You can activate the middle ability targeting a legendary creature that's already a God. You'll put a +1/+1 counter on it.