You get beats for later too, so you dont invest a card in the abilities, they are just nice additions
Plargg and Nassari - When I saw this, I immediately went to Discord and asked the question, Is this a better Etali? Etali, Primal Storm costs one more mana, and triggers on attacks
If you're worried about Boros struggling to draw cards, fret not: cards like Losheel, Clockwork Scholar and Tocasia's Welcome draw cards on both our turns and opponents, and then we've got mass draw heavy hitters like Neyali, Suns' Vanguard and Commander Liara Portyr to really pop off
Once Downerd goes to grave, theres a minimum of 3 types in the graveyard for Dichotomy, among anything else that may have gone to the graveyard
However, the catch is you will need to run both Water and Electric Energy
Incubate lets you turn artifact tokens into Phyrexians, and the black-green draft archetype is all about creating bigger and bigger creatures (and incubate tokens)