They ended up having to ban it, but only did it after it was made obvious how problematic the card was, when some player played the card with no wincons in the deck, just casting it over and over again with no ability to end the game, except hoping the opponent would concede
While Weezing is active, Mew ex can start stacking energy, preparing for an attack
For Palkia Collectors and Legends: Arceus Fans S10P is the definitive set for this audience and has no alternative
Legendary Creature - Goblin Shaman Color tag templates(None) Halana and Alena, Partners First strike (This creature deals combat damage before creatures without first strike.) Reach (This creature can block creatures with flying.) At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is Halana and Alena's power
In modern however this looks pretty naughty, there are many ways to make it instant at which point it is a very dangerous card indeed
Marwyn, the Nurturer Formerly the top elfball commander and still one the best mono-green commanders, former cEDH staple Marwyn, the Nurturer still ramps to throw a lot of elves on the table, and a Marwyn Commander deck can include a variety of combos if youre so inclined