While this may appear as a downside at first glance, this can make Phenax quite difficult for your opponents to remove from play after all, creatures are easier to get rid of than enchantment
As if Rakdos needed more abilities, he also comes with a built-in free sacrifice outlet, letting you sacrifice a creature to make him indestructible until end of turn, though you have to tap him and you can only do it once per turn
Elanor Gardner is awesome here, since each time The Goose Mother attacks and sacrifices a Food to draw a card, Elanor triggers and lets you search your library for a basic land card and put it on the battlefield tapped
For example, you could give the poison fox a red streak on the side of its fur and give it a second set of ears
Improvise can never pay for any colored mana in a spells cost, nor for specifically colorless mana (like the final mana symbol in Reality Smashers mana cost)
But the damage negation isn't really important