The element die decides what counts as a match this turn; the number die is the number.
You always roll exactly two dice: a number die (1–4 or blank) and an element die (Agni, Jal, Vayu, Prithvi, or blank). Place cards into the 4 slots for free, then pay 1 energy for the first roll. Rerolls cost 2 and reroll both.
At turn end every matched slot fires in order 1→4. Unmatched cards stay stuck on their slot (clog) and keep their Scorch into later turns; pay 1 energy to Exhaust a clogged card off its slot.
Then the enemy acts and your Block decays. Energy each turn = your empty slots (minimum 1), never carried over. Kill the Betaal Sentinel before it kills you.