The huge discrepancy there between costs of loyalty can mostly be explained with the logic that Flame Slash reliably affords card advantage and protects Chandra while Seething Song does neither
They may no longer be on the battlefield
You can even pick a creature type that is not in play to bounce all creatures, yours included, in case you need an emergency reset

5-Color Niv-Mizzet by Michael Rapp 2 Paradise Druid 4 Sylvan Caryatid 1 Dreadbore 2 Abrupt Decay 4 Teferi, Time Raveler 1 Unmoored Ego 1 Deafening Clarion 3 Uro, Titan of Natures Wrath 1 Supreme Verdict 1 Utter End 1 Nahiri, the Harbinger 3 Siege Rhino 1 The Scarab God 1 Tolsimir, Friend to Wolves 4 Bring to Light 3 Niv-Mizzet Reborn 1 Cut // Ribbons 2 Botanical Sanctum 4 Fabled Passage 1 Forest 1 Godless Shrine 1 Island 2 Mana Confluence 1 Mountain 2 Opulent Palace 1 Overgrown Tomb 1 Plains 2 Sandsteppe Citadel 2 Spirebluff Canal 2 Stomping Ground 1 Swamp 2 Temple Garden 1 Watery Grave That makes my choice of flex slots: 1 Dreadbore 1 Unmoored Ego 1 Deafening Clarion 1 Uro, Titan of Natures Wrath 1 Nahiri, the Harbinger 1 Siege Rhino 1 The Scarab God 1 Tolsimir, Friend to Wolves 1 Cut // Ribbons As you can see, I went into the weekend ready for aggressively-slanted creature decks, like Mono-Red and Mono-Black

With the COVID-19 cases starting to rise again in Europe and some countries in full lockdown again, we are not sure how this will affect the distribution
This is good news for players who want to bling out their decks