Partner with Rory Williams (When this creature enters the battlefield, target player may put Rory into their hand from their library, then shuffle.) Whenever Amy Pond deals combat damage to a player, choose a suspended card you own and remove that many time counters from it. Doctor's companion (You can have two commanders if the other is the Doctor.)

Flying, menace Other Insects you control have menace. Whenever one or more cards leave your graveyard, you may create a 1/1 black and green Insect creature token, then put a number of +1/+1 counters on it equal to the greatest mana value among those cards. Do this only once each turn.

Artifacts you control have ward {1}. (Whenever an artifact you control becomes the target of a spell or ability an opponent controls, counter it unless that player pays {1}.) When Elder Owyn Lyons enters the battlefield or dies, return target artifact card from your graveyard to your hand.

Whenever Gollum, Scheming Guide attacks, look at the top two cards of your library, put them back in any order, then choose land or nonland. An opponent guesses whether the top card of your library is the chosen kind. Reveal that card. If they guessed right, remove Gollum from combat. Otherwise, you draw a card and Gollum can't be blocked this turn.

Whenever Gylwain, Casting Director or another nontoken creature enters the battlefield under your control, choose one — • Create a Royal Role token attached to that creature. • Create a Sorcerer Role token attached to that creature. • Create a Monster Role token attached to that creature.

Science Teacher — Each Saga spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast that Saga, copy it for each time you paid its replicate cost. Copies of permanents enter the battlefield as tokens.) Doctor's companion (You can have two commanders if the other is the Doctor.)

Whenever a Zombie or Mutant you control dies, if its power was different from its base power, draw a card. Come Fly With Me — {2}, Sacrifice a creature: Put a +1/+1 counter on target creature you control. It gains flying until end of turn.

Flying Wraiths you control have protection from Ring-bearers. Whenever you cast an instant or sorcery spell, create a 3/3 black Wraith creature token with menace. Then if you control nine or more Wraiths, Wraiths you control have base power and toughness 9/9 until end of turn.

Other Mice you control get +1/+1. When Mabel, Heir to Cragflame enters, create Cragflame, a legendary colorless Equipment artifact token with "Equipped creature gets +1/+1 and has vigilance, trample, and haste" and equip {2}.

Whenever a creature you control with power 2 or less attacks, it gains skulk until end of turn. (It can't be blocked by creatures with greater power.) Whenever a creature with power 4 or greater attacks you, its controller loses 2 life and you gain 2 life.

Nick Valentine, Private Eye can't be blocked except by artifact creatures. Whenever Nick Valentine or another artifact creature you control dies, you may investigate. (To investigate, create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

At the beginning of your upkeep, you lose 2 life and exile the top card of your library. You may play that card for as long as it remains exiled. Each noncreature spell you cast from exile has conspire. (As you cast that spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose new targets for the copy.)

Partner with Amy Pond First strike, lifelink The Last Centurion — When you cast this spell from anywhere other than exile, exile it with three time counters on it. It gains suspend. Then investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

When Sharae of Numbing Depths enters the battlefield, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.) Whenever you tap one or more untapped creatures your opponents control, draw a card. This ability triggers only once each turn.