Your attention is probably automatically drawn to the one going into the man's mouth, but arguably even more disturbing is the maggot boring into his right shoulder, and that horribly swollen, envenomed left arm
This is because it has five activated abilities, each one costing a different color
Playing lots of cheap characters will force your opponent to trade, giving you an early lore advantage, while cards like Rafiki, Mysterious Sage, Control Your Temper!, and Heihei, Boat Snack will help you make favorable trades when your opponent adding too many cards to their board
I'm actually surprised that this card isn't higher on this list for the sheer value it brings to the table
Where it really shines is in decks that have three or more mana types, as Reflecting Pool can help manage the many mana colors alot easier by giving an additional mana of the specific color you need
Sliver Hivelord Sliver Hivelord has a similar benefit to Crystalline Sliver