Bloodsheath Skeleta

Instant - Destroy this: The next attack action card and non-attack action card you play this turn get "This card costs

less to play for each Runechant you control."

Temper

Rulings

From the Crucible of War release notes

The reduction is calculated at the time you play the card, not at the time Blood Skeleta’s ability resolves.
When this card is destroyed, it is sent to your graveyard.
You can play either attack action card or ‘non-attack’ action card in any order.
Bloodsheath Skeleta’s activated ability is an instant. You may activate it anytime you have priority, including during an opponent’s turn, and during the reaction window of either player’s turn.
If the card already has a cost reduction effect such as “This card costs less to play for each Runechant you control.” the reduction effects will stack making it cost 2 less for each Runechant you control.

Keyword notes

Temper - Temper is a new keyword that exists on equipment in Crucible of War. Usually high in defense, Temper equipment presents a choice when it is down to 1{d}, of whether to defend with it one last time and see it destroyed, or save it to use for its ability.