History Teacher — Sagas you control have read ahead. (As a Saga enters, choose a chapter and start with that many lore counters. Skipped chapters don't trigger.)
Doctor's companion (You can have two commanders if the other is the Doctor.)

Enchant Wall
Enchanted Wall can attack as though it didn't have defender.

At the beginning of combat on your turn, this creature explores. Then you may have it become a copy of another creature you control until end of turn. (To have this creature explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Destroy target creature with power 3 or greater.

Target creature gets +7/+7 until end of turn.

Target creature gets +2/+2 and gains flying until end of turn.

Trample, haste
Alliance — Whenever another creature you control enters, double this creature's power until end of turn.

Flying
When this creature enters, you get (three energy counters).
Whenever this creature attacks, you may pay . If you do, put a +1/+1 counter on it.

Flash
As an additional cost to cast this spell, behold a Kithkin and exile it. (Exile a Kithkin you control or a Kithkin card from your hand.)
Other Kithkin you control get +1/+1.
When this creature leaves the battlefield, return the exiled card to its owner's hand.

Increment (Whenever you cast a spell, if the amount of mana you spent is greater than this creature's power or toughness, put a +1/+1 counter on this creature.)
At the beginning of combat on your turn, you may pay . When you do, move X +1/+1 counters from this creature onto another target creature.

Return target creature card from your graveyard to the battlefield. Then if it isn't your main phase, blight 2. (Put two -1/-1 counters on a creature you control.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

Create two 1/1 green Elf Warrior creature tokens. Clash with an opponent. If you win, those creatures gain deathtouch until end of turn. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value. Any amount of damage a creature with deathtouch deals to a creature is enough to destroy it.)

This creature can't be blocked.
This creature doesn't untap during your untap step if an opponent controls two or more creatures.

Landfall — Whenever a land you control enters, put a +1/+1 counter on this creature. It gains flying until end of turn.

Enchant creature
Enchanted creature gets +2/+2 and has mountainwalk. (It can't be blocked as long as defending player controls a Mountain.)

You may exert this creature as it attacks. When you do, it gets +1/+1 and gains flying until end of turn. (An exerted creature won't untap during your next untap step.)

: Put a +1/+1 counter on this creature.

Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards.