When the promotion was run in North America earlier this year, the demand for the cards was high that stocks of it ran out almost immediately
Some characters will get benefits from being at locations
Unlike the paper TCG the only way to get the energy into the Discard Pile is when a Pokmon faints, so if you want to be able to use this early you need to put something out front that your opponent can't afford to ignore
On the other hand, there is a relatively long list of Rares that saw play in Shards of Alara Standard including: Knight of the White Orchid, Noble Hierarch, Knight of the Reliquary, Scute Mob, Martial Coup, Broodmate Dragon, Maelstrom Pulse, Sovereigns of the Lost Alara, Dauntless Escort, Hell's Thunder, Brilliant Ultimatum, Cruel Ultimatum, Sedraxis Specter, and Ad Nauseam
One final thing to be aware of is that you cant put counters on a dead permanent , so playing a creature sweeper to draw off killing your own board only works if Weatherlight Compleated is either above 7 or under 4 counters