Glacierwood Siege

This wedge cycle solves an old three-color problem: how to hand a wedge a payoff that costs only two colors to cast. The enter-the-battlefield choice is the mechanism, letting a Simic shell buy into a slice of Temur or Sultai without ever touching the third color's mana. Here the two modes pull toward opposite gameplans and rarely want the same deck. Temur turns every instant and sorcery into a four-card mill trigger, rewarding a spell-dense build that treats the enchantment as a repeatable engine rather than a one-shot detonation. Sultai instead unlocks lands from the graveyard, a grindy incremental mode that turns cracked fetches and discarded duals into a recurring drip of resources. What links the two halves is that neither pays off immediately: the mill mode needs spells to fire it, and the recursion mode needs a graveyard already worth returning from. Both reward decks committed to stocking the yard, which is the quiet thread under the whole design. There is even a self-cannibalizing wrinkle: the Temur mode can aim its mill at your own library, feeding exactly the kind of graveyard the Sultai mode wants to draw from. You cannot have both, though. The mode is fixed the moment the enchantment enters, so the card asks you to know which deck you are building before it ever reaches the table.