Riga, Enflamed Bastion

{t}: Add one mana of any color. Activate only if
Riga, Enflamed Bastion is a land.
All creatures you control are Warriors in addition
to their other types.
As long as Riga, Enflamed Bastion is your active
plane, whenever a creature attacks you, create a
1/1 white Citizen creature token blocking that creature.