Monument to the Giants

{t}{1}, you lose 1 life, create a clue token
{ut}, gain{r}{r}
Other artifacts tap abilities are un-tap abilities
and they tap during your untap phase.
At the beginning of you upkeep, if you have
exactly 13 life and 3 or more tapped artifacts,
create 4, 8/8 giant creature tokens with hexproof, indestructible, and reach