Windcrag Siege
The choice built into this enchantment splits it across two entirely different clocks, and the split is unusual because neither half helps the other. The Mardu mode is the load-bearing one: it duplicates any triggered ability that a permanent you control fires off the back of an attacker. That is a doubling effect most players only encounter on dedicated Panharmonicon-style pieces, retooled here to key specifically on the combat step. Anything that reads "whenever a creature attacks" now happens twice, and so does any triggered ability that an attacking creature merely causes to fire, a wider net than the tribe's aggressive framing suggests. The Jeskai half is the quiet, self-sufficient one: a recurring upkeep goblin with lifelink and haste, a token that neither snowballs nor demands support but keeps a body coming every turn. Because the mode is fixed as it enters the battlefield, there is no cracking it open two ways over a game; it is two separate cards sharing a frame, one a build-around amplifier riding a deck already generating combat triggers, the other a passive drip of pressure and life that asks for no supporting cast at all. The Mardu line rewards a battlefield already humming with permanents that watch the attack step; the Jeskai line rewards nothing but showing up. Choosing correctly means knowing, before it resolves, which of those two decks you actually built.
