When this creature enters, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Target creature gets +2/+2 until end of turn.

Target creature gets +1/+2 and gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Kicker (You may pay an additional as you cast this spell.)
When this creature enters, if it was kicked, creatures you control get +1/+0 and gain haste until end of turn.

This creature enters tapped.

Target creature gets -1/-1 until end of turn.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Outlast (, : Put a +1/+1 counter on this creature. Outlast only as a sorcery.)

: Creatures you control get +1/+1 and gain vigilance until end of turn. Activate only during your turn. (Attacking doesn't cause them to tap.)

Prevent all combat damage X target creatures would deal this turn.

Flying

Target creature becomes red and gains haste until end of turn. (It can attack and this turn.)
Draw a card.

When this creature dies, you gain 2 life.
, Sacrifice this creature: Exile target noncreature artifact or noncreature enchantment.

Lightning Bolt deals 3 damage to any target.

Whenever you cast a creature spell, tap target creature.

Devoid (This card has no color.)
Target creature can't be blocked this turn.
Draw a card.

Equipped creature gets +3/+3 and has protection from each color that's not in your commander's color identity.
Equip commander
Equip

: Creatures you control get +1/+1 until end of turn.

, : Each player reveals the top card of their library. You may put the revealed cards into their owners' graveyards. If you don't, each player draws a card.

Enchant Mountain
: Enchanted Mountain becomes a 6/1 red Spirit creature until end of turn. It's still a land.
When enchanted Mountain is put into a graveyard, you may return this card from your graveyard to your hand.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
, Pay 2 life: Remove a counter from target nonland permanent.

Counter target blue instant spell.

You may cast this spell as though it had flash if you pay more to cast it. (You may cast it any time you could cast an instant.)
Ghitu Fire deals X damage to any target.

, , Sacrifice this creature: Destroy all enchantments.

At the beginning of your upkeep, you may put a charge counter on this artifact.
: You may put a creature card with mana value equal to the number of charge counters on this artifact from your hand onto the battlefield.

Return a Forest you control to its owner's hand: Untap target creature. Activate only once each turn.

, : Target player discards two cards. Activate only as a sorcery.
Channel — , Discard this card: Target player discards four cards. Activate only as a sorcery.

Mill two cards.
Draw a card.

, , Sacrifice this creature: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Lifelink
, Sacrifice this creature: Target creature or enchantment you control gains protection from the color of your choice until end of turn.

, , Discard a card: Create a 1/1 white Human Soldier creature token.

Target creature gains flying until end of turn.
Draw a card.

Counter target instant or sorcery spell unless its controller pays .
Draw a card.

( can be paid with either or .)
If an instant or sorcery card would be put into a graveyard from anywhere, exile it instead.