Tristan, Voice of Innocence

Tristan cannot be enchanted or equipped.
You cannot create Gold or Treasure tokens.
Whenever a source would deal damage to you or
a permanent you control, prevent 2 of that
damage. If a spell or ability, an opponent
controls, causes any of the following to happen,
search your graveyard, hand and library for a
card named "Tristan, Purity Unleashed" and put
it into play.: A creature with power 1 or less dies. Control of a permanent changes.
You discard a card. A spell is countered.