When a minion has Fuse (N): X, then N of your turns after it comes into play, at the end of your turn, X happens. So, if you play a minion with Fuse (2): Deal 5 damage to the enemy hero, then nothing happens at the end of the first turn when you play it, but and the end of your second turn, it will deal 5 damage to the enemy hero. Fuse effects happens just once. Also, they do not trigger on death, so if you kill them, the effects never happens. If the minion comes into play from out side your hand (e.g., from a Piloted Shredder) the effect will still happen. It counts as N of your turns, so if it comes into play on your opponent's turn, a Fuse (1) minion would trigger at the end of your first turn if it survives. Here are some examples:
Next Keyword: Mercenary
Pretty cool idea. A little bit complicated, but still interesting. I think it should happen every N turns though.
Dodge: X - When minion takes damage, X damage is ignored. Damage can be reduced to 0. (So for instance Dodge: 1 will ignore 1 damage when the minion takes damage. If it's 1, the damage is reduced to 0. 2 would be reduced to 1, 3 to 2, and so forth and so on.)
Humiliate: Set a minion's attack to 0.
Humiliation (Spell)
(3)(Rare)(Priest)
Humiliate target enemy minion.
Hum1l1at0r (Minion)
(5)(Epic)(Neutral)(Mech)
5/5
Battlecry: Humiliate target enemy minion until the beginning of your next turn.
Next: Exile
Dodge: X - When minion takes damage, X damage is ignored. Damage can be reduced to 0. (So for instance Dodge: 1 will ignore 1 damage when the minion takes damage. If it's 1, the damage is reduced to 0. 2 would be reduced to 1, 3 to 2, and so forth and so on.)
Next: Shine or Shining
Purge: When a minion with Purge deals combat damage to another minion, it Silences it (before death if it dies).
Next: Transmogrify
Next: Timewarp
Dream X: Target minion returns to owner's hand at the end of X turns if it's still alive.
Next: Cursed
Bribe(X): If you have sufficient mana when playing this minion, you will spend an additiona X mana for the added effect stated on the card.
Next: Bloodlust
Feral - Effect on Beast minions only. Effect is active as long as you have a copy of that minion in your hand.
(Not making visual cards for these. Sorry for the text-only.)
White Tiger
(5) (Rare) (Neutral)
Beast
5/5
Feral: Gain +2/+2.
Crypt Scorpion
(3) (Epic) (Neutral)
Beast
3/4
Feral: Has "Deathrattle: Summon Crypt Scorpion from your hand."
Next: Echo