Because of the “Guardian” in his name you can search Infernity Guardian with Arsenal Summoner’s effect.
Infernity Guardian can only use his effect when you have no cards in hand, so here are some effects to empty your hand. Into the Void gives you an additional draw and discards the rest of the cards you don’t use by the End Phase. Phantom Hand temporarily banishes your entire hand from your Main Phase to your next Standby Phase. Rope of Life can revive your monster with additional 800 attack and dump your entire hand to the graveyard.