Use artificial morph to go inside the nook at the top-left of Mother Brain, then perform a Crystal Flash to stand up. Samus will take rapid damage from the Rinkas during the Crystal Flash but will be able to survive with the help of 75% damage reduction from suit protection.

Entrance condition:

"comeInWithGMode": {
  "mode": "any",
  "morphed": true
}

Requires:

{"notable": "Moondance Clip"},
{"not": "f_MotherBrainGlassBroken"},
"canTrickyGMode",
"h_artificialMorphMovement",
"h_artificialMorphCrystalFlash",
"h_fullEnemyDamageReduction",
{"resourceCapacity": [{"type": "RegularEnergy", "count": 299}]},
{"resourceAtMost": [{"type": "Energy", "count": 800}]}

Dev note: We don't bother modeling the obstacle 'A' state here. The strat will end with R-mode if direct G-mode was used. But it doesn't matter, since this strat requires an E-Tank, which means that R-mode (for 'light pillar' during the Mother Brain 2 fight) wouldn't be useful.