Create a Lander token. Then you may sacrifice an artifact. When you do, Lithobraking deals 2 damage to each creature. (A Lander token is an artifact with ", , Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.")

When this Spacecraft enters, you may sacrifice a land or Lander. If you do, search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.
Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft. Station only as a sorcery. It's an artifact creature at 7+.)
7+ | Flying

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

This creature can't be blocked as long as you've sacrificed an artifact this turn.
Whenever this creature attacks, draw a card, then discard a card.

Flying
When this creature enters, support 2. (Put a +1/+1 counter on each of up to two other target creatures.)

Flying
Whenever another creature you control enters, you gain 1 life.

At the beginning of your end step, draw a card for each card type among spells you've cast this turn.

Menace, prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Other Allies you control have menace and prowess.
Whenever you cast a noncreature spell, create a 1/1 white Ally creature token.

Web-slinging (You may cast this spell for if you also return a tapped creature you control to its owner's hand.)

When U.S.Agent enters, create a colorless Equipment artifact token named Sturdy Shield with "Equipped creature gets +1/+2" and equip . Attach it to U.S.Agent.

Vigilance (Attacking doesn't cause this creature to tap.)
When Doctor Jane Foster enters, return target creature card with mana value 3 or less from your graveyard to your hand. If you gained life this turn, return that card to the battlefield instead.

Landfall — Whenever a land you control enters, put a +1/+1 counter on target creature you control.
: This enchantment becomes a Bear creature in addition to its other types and gains "This creature's power and toughness are each equal to the number of lands you control." (This effect doesn't end.)

When Thrór's Map enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
, : Draw a card, then discard a card.

When this artifact enters, investigate twice. (To investigate, create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
: Create a 1/1 colorless Thopter artifact creature token with flying. Activate only if you've sacrificed an artifact this turn.

This land enters tapped.
: Add .
Cycling (, Discard this card: Draw a card.)

Up to two target creatures each get +1/+0 and gain first strike until end of turn. (They deal combat damage before creatures without first strike.)
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.)

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
Max speed — , Sacrifice this creature: Copy target spell you control. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Incinerating Blast deals 6 damage to target creature.
You may discard a card. If you do, draw a card.

Whenever this creature attacks, you may collect evidence 3. When you do, put a +1/+1 counter on target creature you control. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)

Whenever this creature attacks, each opponent loses 1 life.