If you want to focus on countering Floowandereeze, Droll is better, but if you also consider Despia, I think Effect Veiler is better
When your opponent activates a Spell/Trap Card or effect (Quick Effect): You can detach 2 materials from this card
Do you also have a tortoise who likes chomping on overpowered planeswalkers
In fact, Erebus itself has its own graveyard effect by discarding a Monarch spell/trap you can return one Monarch from your graveyard to your hand, allowing you to use those powerful on-summon Monarch effects all over again
For every Tree of Redemption or Akroma you open, you'll also get a Jace, the Mind Sculptor and an Imperial Recruiter sooner or later, and it all works out in the end
a storm of lightning bolts for Jolteon, the moonlit city streets for Umbreon, etc