The black spell can force you to sacrifice your creature with the highest mana value, which is often either going to be your commander or game-winning piece
As I discussed before with Name Dropping, there are a lot of adverbs, adjectives, and common words like The and Of, and you can also find lots of cards with words in them like Spell, Lightning, and Goblin
If that card was released before 2009 Ill up that to $20
Sure, phasing your permanents out protects them better than indestructible does, but blanket protection for everything you control for only 2 mana is nearly unrivaled
I always use the Dueling Nexus deck editor to build my decks You can press the shuffle button as many times as you want to look for any bad opening hands.
However, these split cards are permanents that enter the battlefield when they resolve, and the second room can be opened at a later time by paying its mana cost