MTG Salvation

Subject in title.

How many creatures are strong enough to 1-hit kill in a Xenagos, god of revels deck, assuming a player is still at 40 life? So far I've heard of Malignus, phyrexian hydra, putrefax and phyrexian juggernaut. I really thought there was more than that, but green/red really are my least played colors

Maybe you guys know of any? Thanks in advance for any suggestions

Edit: not sure what happened to the title lol. It said "how many creatures are strong enough to 1-hit an opponent in a xenagos deck?". It got cut off when I posted it :/

Blightsteel Colossus, obviously. I mean, it's a bit of overkill with Xenagos, but I guess it can punch past a few blockers with the pump.

There are some others, but they are more conditional - Adamaro, First to Desire, Mossbridge Troll, Wilderness Elemental, etc. For non-conditional, you need at least 20 power or 5 infect, which doesn't offer a lot of options. Is there a reason you want to assume still at 40 life? Because if that barrier was lowered a bit, there would be a lot more options.

Scourge of the Throne isn't technically a 1-shot but provided you go after the player with the highest life total you'll get a second combat phase and an absurdly large Dragon to finish said player off with.

Edit: Whoops, I was thinking about 1v1 with 30 life, thats where most of my Xenagod experience comes from, you'd end up 7 life short of a knockout in 40life format, my apologies.

Ghoultree and a source of double strike, perhaps?

Edit: a big Savageborn Hydra, and Atarka, World Render can get pretty close on his own.

Some off-the-wall options:

Golgari Grave-Troll - Dredge 6 feeds the graveyard and allows you to grow it pretty big.

Boneyard Wurm, Splinterfright, Ghoultree - If you have ways of feeding the graveyard, these can get extremely big for little cost.