Galunga, Behemoth Sentinel

Galunga, Sentinel Behemoth has Defender and
is Unaffected by opponents' card effects.
Galunga, Sentinel Behemoth has affinity for artifacts.
When Galunga, Sentinel Behemoth enters the battlefield, each artifact creature you control has indestructible until the end of the turn.
"The calmest of the behemoths, Galunga has taken
to the role of a protector through choice.
No such intent was given to him by us."