with only reasoning in hand:
activate reasoning
activate metalfoes fusion
activate aquamirror
summon aldhibah
activate meteonis
summon eltanin using aldhibah and summon aldhibah
summon fafnir
summon 2 idaten by detaching from fafnir and add meteonis to hand
summon altais / thuban using idaten
summon cross-sheep using idaten and any drytron
summon augus and activate sheep (augus chain link 2)
shuffle magical blast and blasting the ruins into the deck, draw them and discard metalfoes fusion and aquamirror
set them and activate them next turn