(An ongoing scheme remains face up until it's abandoned.)
Whenever a creature attacks and isn't blocked, if you're the defending player, create a 0/1 green Plant creature token that's blocking that creature.
When four or more creatures attack you, abandon this scheme at end of combat.
Near Mint - $3.10
Near Mint Non-English - $3.10
Lightly Played - $2.80
Lightly Played Non-English - $2.80
Played - $2.20
Played Non-English - $2.20
Heavily Played - $1.90
Heavily Played Non-English - $1.90
Damaged - $1.60
Damaged Non-English - $1.60