You can see loads of good stuff from this Merfolk Shaman
Not only are they easier to pull from booster packs, but they're generally the most helpful when setting up your Pokmon cards for success

Teval EDH | Commander | Abe Sargent Commander (1) 1 Teval, the Balanced Scale Creatures (22) 1 Colossal Grave-Reaver 1 Draining Whelk 1 Eternal Witness 1 Fangkeeper's Familiar 1 Hermit Druid 1 Kishla Skimmer 1 Kheru Goldkeeper 1 Lord of Extinction 1 Lotuslight Dancers 1 Mortivore 1 Muldrotha, the Gravetide 1 Mulldrifter 1 Mystic Snake 1 Ramunap Excavator 1 Sakura-Tribe Elder 1 Satyr Wayfinder 1 Sidisi, Brood Tyrant 1 Six 1 Tasigur, the Golden Fang 1 Timeless Witness 1 Transcendent Dragon 1 Wight of the Reliquary Spells (15) 1 All Suns' Dawn 1 Arcane Denial 1 Bala Ged Recovery 1 Beast Within 1 Fell the Profane 1 Lie in Wait 1 Life from the Loam 1 Living Death 1 Rise of the Dark Realms 1 Rise of the Witch-king 1 Rite of Renewal 1 Splendid Reclamation 1 Welcome the Dead 1 Will of the Sultai 1 Windfall Enchantments (7) 1 Glacierwood Siege 1 Out of the Tombs 1 Oversold Cemetery 1 Ripples of Undeath 1 Teval's Judgment 1 Tortured Existence 1 Walk-In Closet // Forgotten Cellar Artifacts (8) 1 Conduit of Worlds 1 Commander's Sphere 1 Essence Anchor 1 Mind Stone 1 Sol Ring 1 Soldevi Digger 1 Stonespeaker Crystal 1 Vessel of Endless Rest Lands (38) 5 Forest 4 Island 5 Swamp 1 Academy Ruins 1 Bojuka Bog 1 Boseiju, Who Endures 1 Breeding Pool 1 Command Tower 1 Drownyard Temple 1 Evolving Wilds 1 Fabled Passage 1 Fetid Pools 1 Hedge Maze 1 Kishla Village 1 Memorial to Folly 1 Mistrise Village 1 Opulent Palace 1 Otawara, Soaring City 1 Overgrown Tomb 1 Shifting Woodland 1 Takenuma, Abandoned Mire 1 Terramorphic Expanse 1 Undercity Sewers 1 Underground Mortuary 1 Volrath's Stronghold 1 Watery Grave 1 Zagoth Triome There we go

Legendary Creature - Human Soldier Threefold Thunderhulk This creature enters with three +1/+1 counters on it
I have no idea, but Id pet them anyway
You could try to get as many ways to gain life into your deck as possible, but there isnt exactly an excess of those in Rakdos