Destroy all creatures, then any number of target players each mill half their library, rounded down.

Creature tokens get -1/-1.

Creatures you control get +0/+1 and have reach. (They can block creatures with flying.)

Double strike
Éomer enters with a +1/+1 counter on it for each other Human you control.
When Éomer enters, target player becomes the monarch. Éomer deals damage equal to its power to any target.

Change the text of target spell or permanent by replacing all instances of one basic land type with another. (For example, you may change "swampwalk" to "plainswalk." This effect lasts indefinitely.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Destroy target creature or planeswalker. Each creature that convoked this spell connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)

Vigilance, lifelink
, Pay 7 life: Destroy target nonland permanent. Activate only during your turn.

( can be paid with either or 2 life.)
Choose target card in a graveyard other than a basic land card. Search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. Then that player shuffles.

Choose target creature. Whenever that creature is dealt damage this turn, it deals that much damage to each other creature and each player.

Creatures your opponents control enter tapped.

Equipped creature gets +3/+1.
Whenever equipped creature attacks, create two tapped 1/1 white Spirit creature tokens with flying. If that creature is legendary, instead create two of those tokens that are tapped and attacking.
Equip

Trample, haste
Whenever Eivor deals combat damage to a player, you mill that many cards. You may put a Saga card and/or a land card from among them onto the battlefield.

(: Add or .)
This land enters tapped unless you control two or more basic lands.

Changeling (This card is every creature type.)
Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature.

Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)
Equip

Flying, lifelink
Spells you cast have delve. (Each card you exile from your graveyard while casting those spells pays for .)
Whenever you cast a spell, you lose life equal to its mana value.

: Add . Activate only if you control five or more lands.

If a red instant or sorcery spell you control would deal damage, it deals double that damage instead.

Whenever you gain life, you may pay , where X is less than or equal to the amount of life you gained. If you do, draw X cards.

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.