On-discard effects are card effects which activate when that card is discarded from the player's hand. These effects are not activated if the card is overdrawn, due to attempting to draw the card while having a full hand; discarded from the deck by effects such as 
Fel Reaver; or destroyed through any other means.[1]
On-discard effects are comparable to Deathrattles in that they activate when the card itself is removed from the game. They are distinguished from other discard-related effects such as 
Malchezaar's Imp which activate when another card is discarded.
There are currently nine cards with on-discard effects: the warlock spells 
Fist of Jaraxxus, 
Scourge Supplies, Soul Barrage, and the warlock minions Silverware Golem, 
Clutchmother Zavas, 
High Priestess Jeklik, Walking Dead, Amorphous Slime, and Savage Ymirjar. The mechanic fits well with the warlock class, which has a strong relationship with discard effects.
Strategy
On-discard effects act to mitigate the downside of discarding cards, giving the player a significant advantage when they discard these specific cards. This rewards discard effects such as Succubus, 
Doomguard and Deathwing, saving the player mana, improving tempo, and potentially saving other cards from being discarded.
Cards
- For Wild format listings, see On-discard effect/Wild format
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Patch changes
Patch 3.0.0.9786 (2015-08-18): Added, with Fist of Jaraxxus.
References
- ↑ Whirthun on Twitter. (2015-08-07).
