MTG Treachery

You can’t pay the unveil cost if you have no cards in hand.
The Supplier’s fourth and fifth abilities can be activated only while the identity card is face up.
If The Supplier affects a suspended card, the card loses its time counters and is no longer suspended. (This doesn’t trigger the last ability of suspend.)
If The Supplier affects a card that’s haunting a creature, the haunt effect ends.

{m} is the gem symbol. It represents one gem counter.
Gem counters are a kind of counter that a player may have. They’re not associated with specific permanents. (Other kinds of counters that players may have include poison, energy and experience.)
Keep careful track of how many gem counters the player has. You may do so by keeping a running count on paper, by using a die on that card, or by any other clear and mutually agreeable method.
If an effect says you get one or more {m}, you get that many gem counters. To pay one or more {m}, you lose that many gem counters. Any effects that interact with counters a player gets, has, or loses can interact with gem counters.