Mutated Mass (Blue)

You may play this from your banished zone.

This card's

and

are equal to twice the number of cards in your pitch zone with different costs.

Blood Debt

Rulings

From the Monarch release notes

You can attack or defend with Mutated Mass even if your pitch zone is empty. 0 is a value.
Mutated Mass’s base power and defense is * even when it’s in a zone that’s not the combat chain. (For example it has 6 in your hand if you have 3 cards with different costs in your pitch zone)
Cards with no pitch value will count as cost 0 for Mutated Mass. (This is because it requires a value to be returned. This is different from when looking at if a card has cost 0.)
Cards with X in it’s pitch value will have it’s X counted as 0. For example a card with cost XX counts the same as having a cost 0 in your pitch zone.
Mutated Mass’s is continuously checking the pitch zone. It does not start a chain or trigger.

Keyword notes

Blood Debt - Blood Debt is a new keyword existing on Shadow cards. Shadow cards can inflict a loss of life to access a greater power. At the end of your turn, you lose 1{h} for each blood debt card in your banished zone.

You only lose life at the end phase. Players do not have priority during the end phase.
If you have multiple cards with blood debt, you lose 1 for each instance of blood debt at the end of turn.
Only face-up cards banished with blood debt counts and will lose you . Face-down banished cards have no effects or stats.