({3} magic symbol) ({W} magic symbol) plus commander tax if applicable the first turn, and ({4} magic symbol) ({G} magic symbol) ({U} magic symbol) the second turn available.
Steps
Cast
Romana II either from your hand or from the command zone by paying ({3} magic symbol) ({W} magic symbol) plus commander tax, if applicable.
The Sixth Doctor triggers, creating a token copy of
Romana II that isn't legendary.
During another turn, cast
Adrix and Nev by paying ({2} magic symbol) ({G} magic symbol) ({U} magic symbol) .
The Sixth Doctor triggers, creating a token copy of
Adrix and Nev that isn't legendary.
Resolve the
Adrix and Nev spell.
Activate a
Romana II by paying ({1} magic symbol) and tapping it, creating four token copies of the
Adrix and Nev token that aren't legendary.
Activate the other
Romana II by paying ({1} magic symbol) and tapping it, creating 64 token copies of the
Adrix and Nev token that aren't legendary.
Whenever you create a token from this point on, you will create 2^70 times as many of those tokens due to the 70