The Londoner

Indestructible, shroud, annihilator 5
As long as you have 5 or less creatures, The Londoner is not a creature.
The Londoner's power and toughness are each equal to the number of creatures you control.
When The Londoner is not a creature, other creatures you control have +5/+5, trample, shroud, and vigilance.
When The Londoner is a creature, other creatures you control have +1/+1, menace, first strike, and deathtouch