While Invasion of Regatha has some interesting uses, for the most part, there are other cards that do the same thing but better (Stoke the Flames for the front and Solphim, Mayhem Dominus or Urabrask for the back), which puts the battle in C-tier
Fluttershy costs 1 colorless, 1 White, and 1 Green
$24.69 Out of stock
The loot is usually discarded
Wizards R&D has repeatedly tried to get a combine your creatures mechanic right, and after the success of host/augment in Unstable, it seemed they were getting close
Creative Energy and Creative Energy Collector's Edition 0003_MTGMH3_CmdFace: Satya, Aetherflux Genius 0006_MTGMH3_CmFeatur: Cayth, Famed Mechanist 0146_MTGMH3_Vanity: Satya, Aetherflux Genius 0142_MTGMH3_ComPorEc: Satya, Aetherflux Genius 0137_MTGMH3_ComPorEc: Cayth, Famed Mechanist 0150_MTGMH3_EclVanty: Satya, Aetherflux Genius Check out the cards from Creative Energy and Creative Energy Collector's Edition in the Modern Horizons 3 Card Image Gallery
