Israeli President Isaac Herzog has tasked Gadi Eisenkot, leader of the centrist Yashar party and head of an anti-Netanyahu alliance, with forming the next government. The formal ceremony takes place Sunday. The decision follows an October election in which Netanyahu's bloc won 53 seats to Eisenkot's 48 — but Eisenkot secured what Netanyahu refused to seek: endorsements from both Arab majority lists, who hold a historic 19 seats. The arithmetic is straightforward and merciless. Israel's Knesset requires 61 of 120 seats for a governing majority. Eisenkot's 48 Zionist seats plus 19 Arab seats reach 67 on paper — more than enough. But paper coalitions and governing coalitions are different animals. The path requires bridging secular centrists, Arab parties with fundamentally different security priorities, and potentially ultra-Orthodox factions whose demands on religious law and military exemptions have collapsed prior governments. Arab political inclusion at this level is structurally novel for Israel. Governments have previously relied on Arab votes — Rabin's coalition depended on them from the opposition until his assassination in 1995, and Ra'am joined the Bennett-Lapid coalition in 2021-2022. But the scale here is different. Nineteen seats is not a supporting vote from the margins; it is a load-bearing pillar. The political establishment's long-standing taboo against formal reliance on Arab parties is being stress-tested at unprecedented scale. Netanyahu's camp, despite winning the most seats at 53, could not reach 61 after ruling out cooperation with Arab parties. This is the structural consequence of that refusal: the largest bloc locked itself out of a viable coalition. Herzog's decision to hand the mandate to the second-place finisher reflects cold parliamentary logic, not a technicality. The president's role is to identify the candidate most likely to form a government, and endorsements matter more than raw seat counts. Eisenkot has 28 days to secure his 61 votes, with a possible 14-day extension from Herzog. The clock is the pressure mechanism. Every day of negotiation raises the price demanded by smaller parties, and every concession to one faction risks losing another. Ultra-Orthodox parties, whose participation may be necessary for a stable coalition, hold demands that directly conflict with the secular and Arab blocs. If Eisenkot fails, the mandate rotates to another candidate — almost certainly Netanyahu, who faces the same arithmetic problem from the opposite direction. If no one succeeds, Israel returns to elections for what would be yet another cycle of political paralysis. The country has held five elections in four years in recent memory; a sixth would confirm that Israel's parliamentary system is structurally unable to produce stable governments under current demographic and political alignments. The 20-year question is whether Arab political integration becomes normalized or whether this moment is remembered as an exception that collapsed under its own contradictions. If Eisenkot succeeds, it redefines the boundaries of coalition politics in Israel permanently. If he fails, the lesson absorbed by future candidates may be that the taboo was right — not because Arab parties are unfit partners, but because the political cost of including them remains too high for any coalition to bear.