You control at least one additional artifact, enchantment and/or token.
Steps
1Cast Thunderous Debut by paying and sacrificing an artifact, enchantment or token.
2Holding priority, cast Naru Meha by paying .
3When Naru Meha enters the battlefield, it triggers, copying Thunderous Debut.
4Activate Phyrexian Altar by sacrificing Naru Meha, adding one mana of any color.
5When Naru Meha dies, Mortuary triggers, putting Naru Meha on top of your library from your graveyard.
6Resolve 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.