Invasion of Gobakhan // Lightshield Array

Targeted discard usually resolves and vanishes; here the front half turns that effect into a permanent with an attack clock. When the Siege enters, it looks at an opponent's hand and exiles a nonland card, but the card is not destroyed: it is taxed. Its owner may still play it for two extra mana, and crucially that exile persists indefinitely, until the card is played, regardless of whether the Siege is ever defeated or leaves the battlefield. So the effect reframes as a standing tempo tariff rather than a race against the Siege's own lifespan. What defeating the battle earns you is a separate reward on the far side: Lightshield Array, a payoff that grows every creature that attacked and keeps a one-shot protection button in reserve.

The two faces pull toward different game plans, which is the honest tension in every well-built Siege. The front half wants to strip a threat and then get swung at (you choose one opponent to protect the battle while every other player, including you, can attack it), and the transform is gated not by a ticking timer but by removing its defense counters: the battle flips only once those counters have been beaten off it, so you are trading incoming attacks for the back-side payoff. That payoff rewards a board already committed to combat, and its sacrifice line, granting your team hexproof and indestructible until end of turn, is the closer's insurance against a sweeper or a losing block. The whole card is a delayed reward dressed as immediate disruption: two mana of tempo now, then combat and damage spent to unlock a second card entirely.