Legality depends on the tournament format -- Squall Drifter can be legal in some formats and banned or restricted in others
Additionally, if an opponent would target their own permanents with beneficial effects, a player can cause Spellskite to receive these benefits instead, meaning it often must be answered as quickly as possible
As more and more cards have been released into the game, the rare slot has been filled to the brim with all sorts of powerful cards, leading some to top the charts when it comes to price
Path of Annihilation Marcy: Fairly interesting little ramp card, if a little slow in doing so, but it does sort of give you Eldrazi Convoke
In form and function, this an Amber/Sapphire all-Disney Princess deck, where each princess may help others, with stacking abilities
A good rule of thumb is that the more resources your opponent has, the less drawing a card helps them, so if you are behind on cards this is likely worth activating