Fblthp, The Guildpact?

Casting a spell that colors match a guild pairing
lets you cast a spell for free as listed below
Azorious Pride — Dramatic Rescue
Dimir Pride — Warped Physique
Rakdos Pride — Rakdos Charm
Gruel Pride {line} Pit Fight
Selesnya Pride {line} Seeds of Strength
Orhoz Pride {line} Executioner's Swing
Golgari Pride {line} Grisly Salvage
Simic Pride {line} Hydroform
Izzet Pride {line} Chemister's Trick
Boros Pride {li