For a more comprehensive catalog that includes all distinct printings, artworks, and variants, community-driven databases like Scryfall are widely used and highly respected by collectors
Returning two islands to your hand is a bit of a steep cost, but the card draw and free spell are fantastic
Your local game store is usually the best place to start
If you think your deck might want it but arent sure its the best fit, that probably means your deck does want it and you should make it fit better
This means that you're trying to hide and reveal the fewest amount of items that you believe you can get away with without being the person who has the fewest overall
If the target creature you control entered the battlefield this turn and is still a legal target as Malamet Battle Glyph resolves but the target creature you don't control isn't, you will still put a +1/+1 counter on the creature you control