Faceless Haven is essentially worth splashing for in every monocolor aggro deck, and the Battle for Zendikar cycle of Shambling Vents / Needle Spires / Hissing Quagmire / Wandering Fumarole / Lumbering Falls saw widespread play during its time in the format
If an Aqua "Tearlaments" monster is sent to your GY by card effect (except during the Damage Step): You can send 1 Level 4 or lower Aqua monster from your Deck to the GY, but if you sent a non-"Tearlaments" monster to the GY, for the rest of this turn you cannot activate cards, or the effects of cards, with the same name as that sent card
(If he would be dealt damage or destroyed, remove a shield counter from him instead.) As long as Captain America has a shield counter on him, you and other Heroes you control have hexproof
Rummaging, mana-less sacrifice and removal on an aggressive body are asking a lot from an uncommon, and Bloodtithe Harvester answers it well
You can only activate 1 "Soul of the Supreme Celestial King" per turn