If an effect allows you to search your library for a card with mana value 4 or less, you can't find Bottomless Pool // Locker Room
All three have strong designs that feel like they could support their own decks with interesting mechanics and are only improved with partner
Masters 25: Uncommons / Commons / Bulk While lacking one super-chase uncommon in the vein of Mishra's Bauble, if you look at the uncommon slot of Masters 25 as a whole, it is very likely the best group of uncommons we've seen in a Masters set, at least since the original Modern Masters
Chapter II protects you from early aggression, and Chapter III should draw you at least two cards and potentially more (say, an opponent is playing mana creatures)
You can't activate Lochmere Serpent's last ability without targeting five cards in a single opponent's graveyard
In addition, Zagras can be an effective way to remove Planeswalkers given that he has flying and haste, and when he or any other of our creatures deal combat damage to a planeswalker it is immediately destroyed