Not being able to tap out while the opponent makes an Angel every turn is not going to make it hard to win the game
His -8 is one of the strongest planeswalker ultimates ever printed, and -- gosh, wouldn't you know it -- you can immediately use it if you had Doubling Season on the battlefield
His ability I Know What I Have to Do allows you to gain a lore every time you banish a character using the card, making it a very valuable way to finish off weakened characters while progressing your lore count towards victory
At the beginning of combat on your turn, if you control one or more Eggs, sacrifice an Egg, then create a 3/3 green Dinosaur creature token
It's not a huge amount of value, but when you consider the fact that you have three opponents, plus anything you do, you can draw upwards of four cards and make four tokens by the time your turn comes back around
Of course in order to have a big impact youll have to have planeswalkers with lots of loyalty to spare (looking at you Karn Liberated, Ugin, the Spirit Dragon, and Nicol Bolas, God-Pharaoh) or have a surplus amount of them