While I dont have confirmation that Ultimate Masters wont have more rares than a normal Masters set, I strongly suspect that twenty mythics will prove the only hinky print run exception
The original five are basically the best fast mana , second only to Black Lotus, another member of the legendary Power 9
For those who dont play a lot of big creatures in order to optimize efficiency, as is common with cEDH decks, Culling the Weak is going to be better suited to your needs
Y'shtola Rhul Rarity: Mythic Rare TYPE: Legendary Creature SUBTYPE: Cat Druid CMC: 6 Mana cost: USD: $4.89 EUR: 4.42 TIX: 0.02 EDHREC RANK: 2733 (3/5) At the beginning of your end step, exile target creature you control, then return it to the battlefield under its owner's control
Skarrgan Hellkite This nasty body has a lot to offer
We retain all the VesperlarkVesperlark combos with cards like Activated SleeperActivated Sleeper, and we can also add more to it