Soul Tyrant

(Transforms from Soul Master.)
Protection from white.
When Soul Tyrant becomes the target of a spell
or ability, sacrifice it.
Whenever Soul Tyrant dies, you get an emblem
with "Whenever a creature you control named
The Knight deals combat damage to a player,
add X colorless mana, where X is the amount of
damage done to that player. Until end of turn,
you don't lose this mana as steps and phases end."