Exile all attacking creatures target player controls. That player may search their library for that many basic land cards, put those cards onto the battlefield tapped, then shuffle.

+2: Until your next turn, up to one target creature gets -2/-0 and loses flying.
−3: Create a 4/4 blue Elemental Bird creature token with flying.
−8: You get an emblem with "Islands you control have ': Draw a card.'"

Double strike, protection from black and from green

This land enters tapped.
When this land enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)
: Add or .

Sacred Fire deals 2 damage to any target and you gain 2 life.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reach
When this creature dies, create a 2/4 black Spider creature token with reach.

Deathtouch, haste
When this creature enters, exile up to one other target creature you control until this creature leaves the battlefield.
Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens.

Lightning Helix deals 3 damage to any target and you gain 3 life.

Enchantment spells you cast cost less to cast.
Whenever an enchantment you control is put into a graveyard from the battlefield, put a +1/+1 counter on this creature.

Flying
When Runo enters, put up to one target creature card from your graveyard on top of your library.
At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If a creature card with mana value 6 or greater is revealed this way, transform Runo.

When this creature dies, it deals 2 damage to any target.

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
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.)

: Add .
, , Sacrifice this land: Destroy target nonbasic land an opponent controls. Each player searches their library for a basic land card, puts it onto the battlefield, then shuffles.

Trample
When this creature enters, each opponent loses 3 life and you gain 3 life.

Whenever a creature you control enters, it fights up to one target creature you don't control with the same mana value.
: Create a Treasure token. Activate only if you control a creature that fought this turn.

Discard your hand, then draw two cards.

: Add or .
Delirium — This creature has deathtouch as long as there are four or more card types among cards in your graveyard.

Equipped creature gets +1/+0 and has "Whenever this creature deals combat damage, create a Blood token." (It's an artifact with ", , Discard a card, Sacrifice this token: Draw a card.")
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Flying
When this creature enters, search your library for a card, put it into your hand, then shuffle.

Whenever a creature you control attacks, it gets +2/+2 until end of turn.