affinity commander deck mtg Urza, Lord High Artificer ARTIFACTS Metalcraft Magic Urza, Chief Artificer Affinity Metalcraft

it asks so many interesting questions of the player

Creature - Beast Cat Landfall (CTRL to add secondary) Lifegain Cleric Class (Gain the next level as a sorcery to add its ability.) If you would gain life, you gain that much life plus 1 instead

9 Roiling Vortex Pay For Your Spells, Or Else You need to pay one red mana each turn you want to turn off lifegain, which isnt as effective as a permanent restriction

This list is specifically rating the quality of the cards that you play so as to check the life gain box in your deck construction

Note that's "cast" and thus happens and cannot be countered traditionally and can be a combat trick to save him from red's burn which is the only thing that can easily answer him or just get him past burn too