Atraxa, Praetors' Voice

An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.

If a permanent ever has both +1/+1 counters and -1/-1 counters on it at the same time, they're removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.

If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has. You can't have it get just one kind of counter it already has and not the others.

Players can respond to a spell or ability whose effect includes proliferating. Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it's too late for anyone to respond.

To proliferate, you can choose any permanent that has a counter, including ones controlled by opponents. You can choose any player who has a counter, including opponents. You can't choose cards in any zone other than the battlefield, even if they have counters on them.

You don't have to choose every permanent or player that has a counter, only the ones you want to add another counter to. Since "any number" includes zero, you don't have to choose any permanents at all, and you don't have to choose any players at all.

Flying, vigilance, deathtouch, lifelink
At the beginning of your end step, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Breya, Etherium Shaper

Breya, Etherium Shaper is banned as a commander in Duel Commander format, but it may be part of your deck.

Breya can be one of the two artifacts sacrificed to pay the cost of its last ability.

When Breya, Etherium Shaper enters, create two 1/1 blue Thopter artifact creature tokens with flying.
{2}, Sacrifice two artifacts: Choose one —
• Breya deals 3 damage to target player or planeswalker.
• Target creature gets -4/-4 until end of turn.
• You gain 5 life.

"Look what we fought for. Look what we built together."

Kynaios and Tiro of Meletis

If the card you draw is a land card, you may choose it to put onto the battlefield.

Starting with you and proceeding in turn order, each player chooses a land card from their hand or chooses not to choose one, but doesn’t reveal any chosen lands yet. Once all players have made this choice, all chosen lands are revealed and enter the battlefield simultaneously.

At the beginning of your end step, draw a card. Each player may put a land card from their hand onto the battlefield, then each opponent who didn't draws a card.

Saskia the Unyielding

If Saskia leaves the battlefield and returns, you choose a player again. It doesn’t remember the previously chosen player.

If a creature you control deals combat damage to the chosen player, it deals that much damage to that player again.

Once the chosen player has left the game, Saskia’s triggered ability will have no effect.

The damage that Saskia’s ability causes a creature to deal isn’t combat damage.

Vigilance, haste
As Saskia the Unyielding enters, choose a player.
Whenever a creature you control deals combat damage to a player, it deals that much damage to the chosen player.

Yidris, Maelstrom Wielder

If Yidris's triggered ability resolves more than once in one turn, spells you cast from your hand will gain cascade that many times. Each instance of cascade triggers separately; resolve one cascade trigger and the spell you cast from it before resolving the next cascade trigger.

Spells you cast from your hand this turn will gain cascade even if Yidris leaves the battlefield.

A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.

Cascade triggers when you cast the spell, meaning that it resolves before that spell. If you end up casting the exiled card, it will go on the stack above the spell with cascade.

Due to a 2021 rules change to cascade, not only do you stop exiling cards if you exile a nonland card with lesser mana value than the spell with cascade, but the resulting spell you cast must also have lesser mana value. Previously, in cases where a card's mana value differed from the resulting spell, such as with some modal double-faced cards or cards with an Adventure, you could cast a spell with a higher mana value than the exiled card.

If a spell with cascade is countered, the cascade ability will still resolve normally.

If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast the card.

The mana value of a split card is determined by the combined mana cost of its two halves. If cascade allows you to cast a split card, you may cast either half but not both halves.

When the cascade ability resolves, you must exile cards. The only optional part of the ability is whether or not you cast the last card exiled.

You exile the cards face up. All players will be able to see them.

Trample
Whenever Yidris, Maelstrom Wielder deals combat damage to a player, as you cast spells from your hand this turn, they gain cascade. (When you cast the 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.)

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Card (5)	Type	^{$0.00 (0.00)} Price
Atraxa, Praetors' Voice	Creature	$0.00 ^(0.00)
Breya, Etherium Shaper	Creature	$0.00 ^(0.00)
Kynaios and Tiro of Meletis	Creature	$0.00 ^(0.00)
Saskia the Unyielding	Creature	$0.00 ^(0.00)
Yidris, Maelstrom Wielder	Creature	$0.00 ^(0.00)