Rares in Crimson Vow were some of the most groan worthy of any set in recent memory, a stark change from Midnight Hunt where Organ Hoarder was better than about half of them

Heres the original deck list: (BLB) - Animated Army View on Archidekt Commander (1) 1 Bello, Bard of the BramblesBello, Bard of the Brambles Instants (5) 1 AbradeAbrade 1 Beast WithinBeast Within 1 Big ScoreBig Score 1 Chaos WarpChaos Warp 1 StarstormStarstorm Enchantments (13) 1 Alchemist's TalentAlchemist's Talent 1 Berserkers' OnslaughtBerserkers' Onslaught 1 Garruk's UprisingGarruk's Uprising 1 Gratuitous ViolenceGratuitous Violence 1 Greater GoodGreater Good 1 Outpost SiegeOutpost Siege 1 Path of DiscoveryPath of Discovery 1 Primeval BountyPrimeval Bounty 1 Rain of RichesRain of Riches 1 Sunbird's InvocationSunbird's Invocation 1 Thickest in the ThicketThickest in the Thicket 1 Unnatural GrowthUnnatural Growth 1 Warstorm SurgeWarstorm Surge Artifacts (14) 1 Arcane SignetArcane Signet 1 Bootleggers' StashBootleggers' Stash 1 Esika's ChariotEsika's Chariot 1 Fellwar StoneFellwar Stone 1 Gilded LotusGilded Lotus 1 Gruul SignetGruul Signet 1 Hedron ArchiveHedron Archive 1 Mind StoneMind Stone 1 Rolling HamsphereRolling Hamsphere 1 Sol RingSol Ring 1 Spine of Ish SahSpine of Ish Sah 1 Talisman of ImpulseTalisman of Impulse 1 Thought VesselThought Vessel 1 Thran DynamoThran Dynamo Sorceries (7) 1 Blasphemous ActBlasphemous Act 1 CultivateCultivate 1 DecimateDecimate 1 ExploreExplore 1 FarseekFarseek 1 HarmonizeHarmonize 1 Rampant GrowthRampant Growth Creatures (21) 1 Brightcap Badger // Fungus FrolicBrightcap Badger // Fungus Frolic 1 Burnished HartBurnished Hart 1 Etali, Primal StormEtali, Primal Storm 1 Evercoat UrsineEvercoat Ursine 1 Garruk's PackleaderGarruk's Packleader 1 Ghalta, Primal HungerGhalta, Primal Hunger 1 Goreclaw, Terror of Qal SismaGoreclaw, Terror of Qal Sisma 1 Grothama, All-DevouringGrothama, All-Devouring 1 Grumgully, the GenerousGrumgully, the Generous 1 Kodama of the East TreeKodama of the East Tree 1 Llanowar LoamspeakerLlanowar Loamspeaker 1 Lotus CobraLotus Cobra 1 Prosperous BanditProsperous Bandit 1 Pyreswipe HawkPyreswipe Hawk 1 Rampaging BalothsRampaging Baloths 1 Sakura-Tribe ElderSakura-Tribe Elder 1 Teapot SlingerTeapot Slinger 1 Tendershoot DryadTendershoot Dryad 1 Trailtracker ScoutTrailtracker Scout 1 Wandertale MentorWandertale Mentor 1 Wildsear, Scouring MawWildsear, Scouring Maw Planeswalkers (1) 1 Domri, Anarch of BolasDomri, Anarch of Bolas Lands (38) 1 Cinder GladeCinder Glade 1 Command TowerCommand Tower 1 Copperline GorgeCopperline Gorge 1 Evolving WildsEvolving Wilds 1 Exotic OrchardExotic Orchard 10 ForestForest 1 Forgotten CaveForgotten Cave 1 Game TrailGame Trail 1 Gruul TurfGruul Turf 1 Karplusan ForestKarplusan Forest 1 Mossfire ValleyMossfire Valley 1 Mosswort BridgeMosswort Bridge 8 MountainMountain 1 Path of AncestryPath of Ancestry 1 Raging RavineRaging Ravine 1 Reliquary TowerReliquary Tower 1 Rootbound CragRootbound Crag 1 Sheltered ThicketSheltered Thicket 1 Temple of AbandonTemple of Abandon 1 Terramorphic ExpanseTerramorphic Expanse 1 Tranquil ThicketTranquil Thicket 1 Wooded RidgelineWooded Ridgeline What Budget Cards Can We Add to Animated Army

Casting and resolving a tribal card follows the rules for casting and resolving a card of the other card type
your Regrowth costs 1, and anything that costs 1 or less becomes free or even generates mana
The same applies to creatures