For three mana, Rielle is a Blue and Red 0/3 that gets +1/+0 for each Instant and Sorcery in your graveyard
Preventing damage when you swing is a way to encourage you to bring the whole team into the fray without worrying about push-back and block-killing the things that had to get double blocked
Creatures (30) 1 Sakura-Tribe Elder 1 Mirri the Cursed 1 Mulldrifter 1 Wurmcoil Engine 1 Hornet Queen 1 Vorapede 1 Master Biomancer 1 Sylvan Caryatid 1 Rhonas the Indomitable 1 Carnage Tyrant 1 Siren Stormtamer 1 End-Raze Forerunners 1 Questing Beast 1 Elder Gargaroth 1 Obsessive Stitcher 1 Nighthawk Scavenger 1 Triplicate Titan 1 Froghemoth 1 Ulvenwald Oddity 1 Jewel Thief 1 Weathered Sentinels 1 Wilson, Refined Grizzly 1 Biophagus 1 Venomthrope 1 Scavenged Brawler 1 Haywire Mite 1 Urborg Scavengers 1 Goldberry, River-Daughter 1 Likeness Looter 1 Weeping Angel Lands (39) 6 Forest 1 Reflecting Pool 1 Underground River 1 Swamp 1 Island 1 Yavimaya Coast 1 Watery Grave 1 Breeding Pool 1 Exotic Orchard 1 Creeping Tar Pit 1 Command Tower 1 Hinterland Harbor 1 Woodland Cemetery 1 Temple of Deceit 1 Temple of Mystery 1 Temple of Malady 1 Lumbering Falls 1 Blighted Woodland 1 Path of Ancestry 1 Morphic Pool 1 Zagoth Triome 1 Bonders' Enclave 1 Rejuvenating Springs 1 Undergrowth Stadium 1 Tyrite Sanctum 1 Witch's Clinic 1 Hall of Storm Giants 1 Shipwreck Marsh 1 Deathcap Glade 1 Dreamroot Cascade 1 Restless Cottage 1 Restless Vinestalk 1 Minas Morgul, Dark Fortress 1 Restless Reef Spells (30) 1 Sol Ring 1 Kodama's Reach 1 Oversold Cemetery 1 Night's Whisper 1 Beacon of Unrest 1 Arcane Denial 1 Nature's Lore 1 Skyshroud Claim 1 Farseek 1 Harmonize 1 Nature's Claim 1 Nihil Spellbomb 1 Golgari Charm 1 Read the Bones 1 Toxic Deluge 1 Reality Shift 1 Painful Truths 1 Ever After 1 Rishkar's Expertise 1 Growth Spiral 1 Return to Nature 1 Shadowspear 1 Fierce Guardianship 1 The Ozolith 1 Feed the Swarm 1 Culling Ritual 1 Agent's Toolkit 1 Mandate of Abaddon 1 Twists and Turns 1 Bitter Triumph Here are the deck stats from our friends at Archidekt: So, what must-have cards might I have missed including here
That's a neat little feature that can buff everything else in your deck
Commanders like Phenax, God of Deception fall in the first category, while commanders like Grolnok, the Omnivore, and Sidisi, Brood Tyrant fall in the second
