Leyline of the Guildpact

The Leyline cycle has always traded a hand slot for a turn-zero effect, but most of its members ask you to want a specific static ability badly enough to run four copies of a dead late-game draw. This one is stranger, because what it grants is not power but universal typing: every nonland permanent you control becomes all five colors, and every land you control becomes every basic land type at once. On its own that reads like a color-identity curiosity, a card that answers questions nobody asked. The strategic axis lives entirely in what else cares about those types. Domain spells count all five basic types automatically. Color-matters triggers fire off permanents that were never that color. Cards that hunt "a creature of the chosen color" or restrict targets by color suddenly find no safe harbor. Its hybrid cost is centered on green (castable for four green mana, but each pip payable with a second color instead), so it drops into any green shell without asking for more than one supporting color. The Leyline clause lets those interactions come online before your first draw step. What limits it is the same thing that defines it: the effect is pure enabler, contributing nothing to the board or the stack by itself, so its value is exactly as high as the payoffs you assemble around it. It belongs to a small tradition of cards that rewrite the metadata of your permanents rather than their stats, and the reach of that rewrite is wider than the flat typing line suggests.