However, thanks to how much you can ramp in Simic colors and with Nadu's ability, you will likely always have the mana to re-cast it , so don't worry if it gets targeted for removal
The caster gets to choose which pile they put into their hand and which they put into their graveyard
In Armageddons case, cards outside of lands ramp you, like Smothering Tithe or mana rocks
from a draft perspective, you take them if theyre good, pass them if theyre not
As strong as these lands seem, they see significantly less play in older formats
One thing they did get me saying was I kind of wish Virus Beetle was legal in Standard. And here we go near instant turnaround on that wish