Lady Guinevere

This creature can't attack or block.
Creatures you control get +1/+1
When Lady Guinevere enters the battlefield,
create two 1/1 white human Knight creature
tokens with first strike.
Whenever you control Lancelot of the Lake and Arthur, King: Create a 0/1 white Baby creature
token with: "This creature can't do anything."
Then each player sacrifices half their creatures, rounded up.