This is number one of my Betrayers favorites. I'll likely have a bunch more over the next few days since this is the first time I've had a good look at the spoiler. Chisei, Heart of Oceans Ahh, this is my favorite kind of creature. Undercosted for its Abilities & P/T, but with drawback that screams "turn me into a positive!". The reason for this is pretty simple, not only are you getting an undercosted creature, it is also supplying an effect which is helping you - makes for a very powerful card. 95% of Magic's permanent counts are positive, so removing them would usually be considered a bad thing (hence the drawback). But there are few playable cards that actually supply you with negative counters, i.e. counters that hurt you. Topping my list is: Wall of Roots - Always been a good card, the Wall gives you the opportunity to drop a 4/4 flyer on turn 3 (or turn 2 if your deck building skills are that ill). Another type of card that generates negative counters is anything with Cumulative upkeep. Staying in color, Mystic Remora is a solid one. Ancestral Knowledge too. You can also try playing Illusions of Grandeur the way it was supposed to be abused. Hey, Illusionary Forces would give you two 4/4 four mana flyers with no drawback. Though my favorite Cumulative upkeep card of all time is easily Tornado, a card I play in my Power Conduit deck. Vindicate every turn is strong.