Meticulous Metalcrafter

When Meticulous Metalcrafter enters the game
you may sacrifice X untapped mountains to put
an indestructible counter on X red creatures.
Whenever you have 4 or more white mana in
your mana pool, your white creatures cost {1} less to cast and come into play with a +1/+2 counter.
{r}{r}{t}: Put a +2/+3 counter on target red
creature you control.