Jacob, Corner Dweller

Your corner is filled. (Your opponents cannot put
space tokens onto the battlefield under your control.)

Multicolored creatures you control have myriad. (Whenever this creature attacks, for each opponent
other than defending player, you may create a token
that's a copy of this creature that's tapped and
attacking that player or a planeswalker they control.
If one or more tokens are created this way, exile the
tokens at end of combat.)