So in my Tezzeret control deck, I put in Inkmoth Nexus, because turning a 1/1 into a 5/5 with Tezz is a good alternate wincon. I have a question about that ability though, does the 5/5 effect go away once it turns back into a land, or does it stay? (I know I could google it, but the way you guys explain stuff helps a lot more than just some random forum)
If it’s this Tezzeret, its third ability specifies “until end of turn”. When the turn ends, the effect will immediately expire.
If it’s this Tezzeret, the Nexus will still be a 5/5 artifact creature after it stops being a land. This Tezzeret’s middle ability doesn’t specify a duration (it doesn’t say “until end of turn,” for example) so it doesn’t expire at any particular time. The Nexus will be a 5/5 artifact creature indefinitely. (Note that it will lose any abilities, creature types, etc. given to it by Inkmoth Nexus’s ability when that ability expires at the end of the turn.)