Mesaana

{t}: Deal three damage to target creature or planeswalker. Draw a card. You may play that
card without paying its mana cost if it shares a
color with Mesaana.
When Mesaana attacks, give +1/+1 to creatures
you control until end of turn.
"Mesaana hid herself because she might be recognised.
She must reside in the Tower itself. On the face of it,
that seemed impossible but nothing else fit"