At the beginning of your end step, for each player, put a +1/+1 counter on up to one target creature that player controls. Each creature with one or more counters on it can't attack you or planeswalkers you control unless its controller pays {X}, where X is the number of counters on that creature.
Near Mint - £3.40
Lightly Played - £2.90
Moderately Played - £2.40
Heavily Played - £1.70
Damaged - £1.10
Near Mint Non English - £3.40
Lightly Played Non English - £2.90
Moderately Played Non English - £2.40
Heavily Played Non English - £1.70
Damaged Non English - £1.10