During your turn, Colossus has indestructible. (Damage and effects that say "destroy" don't destroy him.)
Other Mutants you control get +1/+1.

Flying
Each other Merfolk you control with a +1/+1 counter on it has flying.
At the beginning of combat on your turn, target creature you control connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)

(: Add .)

Willie Lumpkin can't be blocked.
Whenever Willie Lumpkin deals combat damage to an opponent, you draw a card and that player may draw a card. If they do, that player can't attack you or permanents you control during their next turn.

Trample
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Whenever The Seventh Doctor attacks, choose a card in your hand. Defending player guesses whether that card's mana value is greater than the number of artifacts you control. If they guessed wrong, you may cast it without paying its mana cost. If you don't cast a spell this way, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")

Discard a card: This creature gets +1/+0 and gains menace until end of turn. Activate only as a sorcery. (It can't be blocked except by two or more creatures.)

Reveal the top X plus one cards of your library. Choose a creature card and/or a land card from among them. Put those cards into your hand and the rest on the bottom of your library in a random order. If X is 5 or more, instead put the chosen cards onto the battlefield or into your hand and the rest on the bottom of your library in a random order.

Whenever this creature attacks alone, it gets +2/+0 until end of turn.

First strike, haste

: Regenerate this creature.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Scry 2.
II — You may put a Hero creature card with mana value 3 or less from your hand onto the battlefield. If you don't, draw a card.
III — Put a +1/+1 counter on each creature you control.

Counter target creature spell.

: Add one mana of any color. Spend this mana only to cast a creature spell.

(: Add .)

Whenever you put an ability sticker on a creature, put a +1/+1 counter on that creature.
, : You get {TK}. You may put a sticker on a nonland permanent you own.

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
: Enchanted creature gets +1/+0 until end of turn.
: Return this Aura to its owner's hand.

This land enters tapped.
: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Whenever this creature attacks, scry 1.

Ferocious — At the beginning of combat on your turn, if you control a creature with power 4 or greater, put a +1/+1 counter on this creature.