mtg modern card list Elite Rhino Flicker Deck - Abzan Green Black White - Very Powerful - Legal - Custom Built Modern Horizons MH1 | 255

The extra untap and loyalty activation usually creates a lead that your opponents cant ever catch

Put a stun counter on it

While Collected Company itself was never banned, it was the card that caused Reflector Mage to get banned, and its dominance continues to live on today in Modern, where its the backbone of half a dozen decks overloading on twos and threes in order to get the most they possibly can out of their CoCo

Sadly, removing Merieke from the battlefield returns the creature to its owner (if its under your control) before it is destroyed, so you wont be able to take advantage of any death triggers this way

All of that is great, but back then there were answer cards like Swords to Plowshares that could render that moot and stick you with a rather annoying bill