The rebacked and old proxy cards can easily be identified by their weight and thickness while the blue core proxies are of very high quality and are a bit hard to identify and need to be tested by looking at the details of their printing pattern and direct exposure to light for penetrability
Rares and Mythic Rares: Once you have four copies of a rare or mythic rare card, you will not open any more copies in booster packs from the same set
The Archdruid gives every other elf you control a +1/+1 boost
Or, you can use a cheaper spell to blink this creature, like Ephemerate, and have more mana to cast the spell you want to copy
Nissa turns your ramp spells into a powerful two-for-one, adding mana and netting a creature card while youre at it
Each set from Mirrodin Besieged to Gatecrash featured two Event Decks, which were pre-constructed decks designed as an introduction to tournament play