Shale, Disgruntled Golem

Shale cannot attack or block unless you tap
another artifact you control.
Whenever you cast a spell, for each of its colors,
Shale gains the following effect until end of turn.
{w}: Shale gains +0/+2 and vigilance
{u}: Shale gains hexproof
{b}: Shale gains indestructible
{r}: Shale gains +2/+0 and haste
{g}: Shale gains +1/+1 and trample