My piece of advice is that whenever you think a card has an interesting effect, pick it up even if there are cards that can do something similar better or even if you dont see immediate use
On ETB we may destroy any number of artifacts and/or enchantments with total mana value X or less, so it may become an artifact/enchantment wipe if we have enough mana to dump (in that case it also fills the role of a big drop and becomes a real threat)
1 Atraxa, Praetors Voice Atraxa was once an angel from Mirrodin that resisted Phyrexias takeover
(You know the ones which now go for hundreds of pounds on eBay?) It was a gift from my Dad and fully defied my Mum's 'No Pokmon cards' rule
Ideally, for players that are perhaps more interested in the art and collection side of things will find Pocket much easier to dive into, especially if they've ever felt dissuaded from other titles because they arent familiar with all the ins and outs of TCG combat
1 Queza, Augur of Agonies