The Sword, Shield, and Helm of Kaldra were destroyed, along with the champion himself, when the Green Sun, a gigantic ball of mana, burst forth from Mirrodin's core
As long as an opponent has eight or more cards in their graveyard, Thieves Guild Enforcer gets +2/+1 and has deathtouch. This is, clearly, a good time
Then you can cast this by removing counters from your stuff
Alternatively, sets with a high print run or that didnt sell well can be found for the expected value or even less
It doesn't matter if a replacement effect causes the gift you gave to become something else or if a static effect stops the player from receiving that gift
It gets cheaper for each instant and sorcery you cast the same turn, can be cast from your graveyard by exiling instants and sorceries, and can consume and copy spells from your graveyard when it attacks