Fortress Eryas

Fortress Eryas enters the battlefield tapped.
{t}, Pay 1 life: Add {w}, {u}, or {b}.
Whenever you activate an artifice ability of a
creature you control for the first time each turn,
that creature can't be blocked this turn.
"Never seen 'em go in or out, but I know they're there
when I can't sleep from all the bangin'."
Grete, Turan Village Innkeep