Depending on how the League goes, I might also consider Changeling Titan as a neat way to either protect a creature in a Wrath-happy environment or get additional enters-the-battlefield triggers (but there are better ways of doing that)
If cards are banned by house rules, deckbuilding restrictions, budget, whateverthats a completely different story
Then, once you hit critical mass, go for Baldurs Gate
But when you combine him with Agathas Soul Cauldron, things get silly
This can deprive a player of a vital combo piece they've just doubled or ruin token decks with many identical creatures
Its a nice little bonus, but as is the case with Essence Flux, +1/+1 counters can feel a little redundant if your main aim is to be flickering things