Invasion of Ravnica // Guildpact Paragon
Both halves of this battle orbit a single, unusually narrow trait: being exactly two colors. When the Siege enters, it exiles a nonland permanent an opponent controls that isn't exactly two colors, a removal clause with a deliberate carve-out for two-color permanents that reads odd until you flip the card and meet the other end of the thesis. Transform it and the Paragon pays out every time you cast a two-color spell, digging six deep for another. That is the design's real argument: the entry exile punishes mono-color and three-or-more-color permanents while sparing exactly two-color ones, and the dig trigger rewards the tightly two-colored deck the face gestured at. The Siege frame carries a timing wrinkle that trips up players new to the mechanic: you name an opponent as its guardian, yet the Siege itself is the thing under attack, and you and your other opponents can swing at it. The Paragon only arrives once the battle falls, so it is not guaranteed value but a payoff gated behind a race. Read as one card, the buy-in escalates: the exile is loose enough to fire in almost any deck, while the engine on the reverse earns its keep only in a shell built to feed it two-color spells. The exact-two-colors restriction is doing heavier lifting than the removal rate lets on.
