Also, if youre playing Eidolon, you cannot play Experimental Frenzy or Mutavault two cards which I believe help with the matchups you struggle with (midrange decks with a lot of removal such as Black-Red Midrange and Niv-to-Light)
10 Fidget, Sneaky Bat Passing Around Keywords This Emerald Ruby card is not only Evasive, but it can make any of your other characters harder to hit in the process
If you just so happened to cast a Hydra, well two for the price of one
Krosan Beast is a good example of this, with its transformation from a lowly 1/1 Squirrel into a massive 8/8 Beast, and the hatching of Rukh Egg is another
Cast as an aura, Eidolon could easily give +5/+5 or greater to the enchanted creature , and it pops out as an equally-sized threat if the enchanted creature loses the battle