Power-up as the game progresses!

Whenever you cast a silver-bordered spell, put a +1/+1 counter on Border Guardian.
Whenever you cast a black-bordered spell, Border Guardian can't be blocked this turn.
Whenever you cast a white-bordered spell, Border Guardian gains double strike until end of turn.

This land enters tapped.
: Add or .

: Add or .
, , Sacrifice this artifact: Draw a card.

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
: Add .

This land enters tapped.
: Add or .

: Add or .
: This artifact becomes a 1/1 red and white Soldier artifact creature with double strike until end of turn.

: Add or .
, , Sacrifice this artifact: Draw two cards.

, : Add .

: Add .
Channel — , Discard this card: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That player may search their library for a land card with a basic land type, put it onto the battlefield, then shuffle. This ability costs less to activate for each legendary creature you control.

Boseiju enters tapped.
, Pay 2 life: Add . If that mana is spent on an instant or sorcery spell, that spell can't be countered.

Trample
, Sacrifice an artifact: Bosh deals damage equal to the sacrificed artifact's mana value to any target.

, : Until end of turn, you may cast instant and sorcery spells from the top of your graveyard. If a spell cast this way would be put into a graveyard, exile it instead.

Separate Boss Cards and Event Cards

This land enters tapped.
: Add or .
, , Sacrifice this land: Draw a card.

This land enters tapped unless you control two or fewer other lands.
: Add or .

Sacrifice this creature: You gain 3 life.

Trample
When this creature dies, you gain life equal to its power.

, Sacrifice this artifact: Flip a coin. If you win the flip, create a 5/5 colorless Djinn artifact creature token with flying. If you lose the flip, this artifact deals 5 damage to you.

At the beginning of each opponent's upkeep, exile all cards from your hand face down.
At the beginning of your upkeep, return all cards you own exiled with this artifact to your hand, then draw a card.

This land enters tapped.
You may choose not to untap this land during your untap step.
At the beginning of your upkeep, if this land is tapped, put a storage counter on it.
, Remove any number of storage counters from this land: Add for each storage counter removed this way.

Flying, vigilance
Whenever this creature attacks, surveil 1.