You can fill your graveyard with Grisly Salvage and Mulch, draw cards with Night's Whisper and Harmonize, kill your opponent's creatures with Putrefy and Ob Nixilis Reignited, resurrect your dead creatures with Reanimate and Deadbridge Chant, or stymie your opponents with Arachnogenesis or Inscription of Abundance
Attuma, Atlantean Warlord Attuma, Atlantean Warlord is high cost among merfolk lords, but the ability to help you draw cards just for attacking is great in case you don't have any evasion on board
Its matchup against slow decks is much better as a result
They have the card advantage and interaction suite necessary to grind out a long game, though they dont want infinite turns, and they have aggressive threats so they can turn the corner and win quickly
Card Cycle: The Gods of Theros The pantheon of Theros is mighty, and the very presence of its members will change your game