Mana pool
add:
Single tap/click a permanent = abilities menu (Tap for mana → color wheel, activated abilities, Attack in combat, move/counters/flip). Double tap/click = plain tap/untap (no mana). Hand: single = menu, double = cast. Long-press = menu, drag = move/cast. Keys: D draw, U untap all, P next phase, N next turn, S shuffle, Z undo. Casting auto-pays from the pool.