Cast Thunderous Debut by paying ({6} magic symbol) ({G} magic symbol) ({G} magic symbol) and sacrificing an artifact, enchantment or token.
Holding priority, cast Naru Meha by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
When Naru Meha enters the battlefield, it triggers, copying Thunderous Debut.
Activate Phyrexian Altar by sacrificing Naru Meha, adding one mana of any color.
When Naru Meha dies, Mortuary triggers, putting Naru Meha on top of your library from your graveyard.
Resolve the copy of Thunderous Debut, causing you to look at the top twenty cards of your library and put Naru Meha and up to one other creature card onto the battlefield.
Repeat from step 3.
Results
Infinite colored mana.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite sacrifice triggers.
Put all creature cards from your library onto the battlefield.