How it works
After the struck card resolves, the remaining cards flow clockwise or counter-clockwise. Agni reverses the current, Jal pays defensive value, Vayu returns the fired card to hand, and Prithvi anchors it in place.
Legend
Headwater: if the strike lands on the current head of the river, fire at ×2.
Agni: reverse the flow and hit harder.
Jal: gain 3 Block.
Vayu: the fired card returns to hand.
Prithvi: the fired card stays and the flow does not move it.
Akasha: all occupied slots fire at half and the river pauses.