Invisible Woman
Legendary Creature — Human Hero
What the Card Says
At the beginning of combat on your turn, if you've cast a noncreature spell this turn, create a 0/3 colorless Wall creature token with defender and reach. Whenever you attack, you may pay {R}{G}{W}{U}. When you do, target creature gets +1/+0 until end of turn for each creature you control and can't be blocked this turn.
What Does That Mean
This is a 3/3 creature that rewards you for casting noncreature spells by creating defensive Wall tokens at the start of combat.
Additionally, whenever you attack, you can pay four mana (one of each color) to pump a creature with bonus power equal to your creature count and make it unblockable that turn.
Why Is That Important
Invisible Woman fits into spell-focused decks (like Boros or Jeskai control/tempo strategies) that naturally cast instants and sorceries, generating defensive bodies while progressing your game plan.
The unblockable threat ability is particularly strong in decks with many creatures or tokens, turning your wide board into a winning attack.
The four-color mana requirement is steep, but in a deck already built to support it, she provides repeatable evasion and tempo pressure that's hard to answer.