The First Doctor (Serial Numbered) [Doctor Who] Asmodee where X is the number

where X is the number of creature cards in your graveyard

Set: Secret Lair Drop Series Type: Legendary Creature — Kobold Warrior Rarity: Rare Cost: {0} First strike

({B/G} can be paid with either {B} or {G}

then untap all Dragons

From there

The First Doctor (Serial Numbered) [Doctor Who] Asmodee where X is the numberSet: Doctor Who Type: Legendary Creature Time Lord Doctor Rarity: Rare Cost: {1}{W}{U} When The First Doctor enters the battlefield, search your library and or graveyard for a card named TARDIS, reveal it, and put it into your hand. If you search your library this way, shuffle. Whenever you cast a spell with cascade, put a +1 +1 counter on target artifact or creature.