Ragavan is a card thats seen play in every MTG format where it's legal, and left unchecked, it dominates a game
Then it fights up to one target creature an opponent controls
Once you reach six mana, you can cast Dance of the Manse returning Doom Foretold and three other artifacts or enchantments, and then it becomes very hard to lose
Sengir Vampire is the first Vampire in MTG , appearing in the very first set, Alpha
So Hypno's Ability is quite good, and Zen Headbutt does major damage for only two energy cards
Yorion, Sky Nomad - The companion rule for this card specifies you need to play at least 20 more cards than the minimum - this does however in practice just make the minimum 80 cards instead, and people keep to that new number