Mana Vault [Beta Edition] Human Soldier Assassin each player chooses a creature

each player chooses a creature type and returns any number of cards of that type from their graveyard to their hand

He's switched sides so often that he has become everyone's ally yet no one's friend

Set: New Phyrexia Type: Artifact Creature — Phyrexian Horror Rarity: Rare Cost: {2} {U/P}: Change a target of target spell or ability to Spellskite

The bigger they are

Set: Unlimited Edition Type: Enchantment Rarity: Rare Cost: {3}{R} Whenever a player taps a land for mana

Mana Vault [Beta Edition] Human Soldier Assassin each player chooses a creatureSet: Beta Edition Type: Artifact Rarity: Rare Cost: {1} Mana Vault doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap Mana Vault. At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you. {T}: Add {C}{C}{C}.