Oracle

Legendary Planeswalker - Tezzeret 

Creature and planeswalker spells you cast have affinity for artifacts. (They cost 1 less to cast for each artifact you control.)
+2: Tezzeret, Master of the Bridge deals X damage to each opponent, where X is the number of artifacts you control. You gain X life.
-3: Return target artifact card from your graveyard to your hand.
-8: Exile the top ten cards of your library. Put all artifact cards from among them onto the battlefield.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

5/3/2019
Affinity for artifacts means “This spell costs 1 less for each artifact you control.”

5/3/2019
Tezzeret himself doesn’t have affinity for artifacts.

5/3/2019
Affinity doesn’t change the spell’s converted mana cost. It changes only how much mana you pay to cast the spell.

5/3/2019
Affinity can reduce only generic mana in a spell’s cost. It can’t reduce color requirements.

5/3/2019
The cost reduction is set before you pay any of the spell’s costs. Specifically, you could lock in a discount for an artifact you control and then sacrifice that artifact to activate a mana ability.

5/3/2019
If there are any additional costs or cost increases that would apply to a spell with affinity, apply those before applying any cost reductions.

5/3/2019
If a spell has multiple instances of affinity, each applies.

5/3/2019
In a Two-Headed Giant game, Tezzeret’s first loyalty ability causes the opposing team to lose twice X life and you gain X life.

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