Firebloom Cobra

Landfall — When a land enters play under your
control, add one mana of any colour.

Bloodrush — {1}{r}{g}, Discard this card:
Target attacking creature gets +3/+1 until end of
turn. When that creature deals combat damage to
a player this turn, add that much mana in any one
colour. Until end of turn, you don’t lose mana as
steps and phases end.