Power Level 8-10 Tana, the Bloodsower and Tymna the Weaver Not to blow it out of proportion, but the majority of decks will never need to be this good

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Personally, I would just fill the deck with pieces like Ruin-Lurker Bat or Blind Hunter, just so I could have my Batty fun
To double a creature's power, that creature gets +X/+0, where X is that creature's power as The Skullspore Nexus's activated ability resolves
this often goes with Karoo lands or Lotus Field with the general goal of generating an obscene amount of mana or infinite landfall triggers
In the context of its time, it was very likely necessary to keep the game alive