The Twin Shadowmancers

Shadow
Whenever a non-token creature without shadow
enters the battlefield, its controller may pay life
equal to its mana value to create a token copy of
that creature, except it has shadow. If they don't,
you may pay {1} to create a token copy of that
creature except it has shadow.
Some sisters aspire to make each other better. Luna
and Solana aspire to make each other worse.