You only lose the game when you attempt to draw a card while your library is empty
Although, with the rate Wizards is pumping product out, it might not
It can also win games using Jeskai Revelation instead of Monument to Endurance

Advanced Search Sets Random Syntax Academy Elite Adaptive Training Post Aegis of the Legion Aerith Rescue Mission Agent's Toolkit Alaundo the Seer Alchemax Slayer-Bots All Hallow's Eve All of History, All at Once Ambling Stormshell Ammit Eternal Amulet of Quoz Amy's Home Ancestral Knowledge Ancestral Vision Ancient Hydra Apocalypse Hydra Arc Blade Arcane Spyglass Arcbound Javelineer Arcbound Reclaimer Archfiend of the Dross Argent Dais Arixmethes, Slumbering Isle Armageddon Clock Arwen, Mortal Queen Ashling the Pilgrim Assert Authority Atmosphere Surgeon Atraxa's Skitterfang Atraxi Warden Aurification Autograph Book Aven Riftwatcher Axiom Engraver Azor's Elocutors Baku Altar Balduvian Hydra Baloth Prime Bandit's Haul Barkhide Troll Baton of Courage Bazaar of Wonders Belligerent Hatchling Benevolent Hydra Bewitching Leechcraft Biting-Palm Ninja Black Mana Battery Bladed Ambassador Blademane Baku Blastoderm Bloatfly Swarm Bloodcrazed Hoplite Bloodletter Quill Blue Mana Battery Bogardan Phoenix Bolrac-Clan Crusher Bomb Squad Boon of Safety Bottomless Vault Bounty of the Hunt Bounty of the Luxa Braided Net Brain in a Jar Brambleback Brute Brass's Tunnel-Grinder Briber's Purse Brigone, Soldier of Meletis Bristlebane Battler Brokers Veteran Brokers' Safeguard Bronze Tablet

It gives all your dragons indestructible, making it incredibly difficult for opponents to wipe your board
Having a creature this big was remarkable, and his ability was even better