: Add . If you control an Urza's Mine and an Urza's Power-Plant, add instead.

Counter target spell. If that spell is countered this way, its controller may put a creature card from their hand onto the battlefield.

Equipped creature gets +2/+1 and has haste.
Whenever a Warrior creature enters, you may attach this Equipment to it.
Equip

Untap all creatures you control. Samurai creatures you control get +1/+1 until end of turn.

When this creature enters, you may search your library for a creature card with toughness 2 or less, reveal it, put it into your hand, then shuffle.

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
If a permanent would be put into a graveyard, exile it instead.

When this enchantment enters, you draw four cards and you lose 4 life.
At the beginning of your upkeep, if you control four or more Demons with different names, you win the game.

Whenever a creature you control with power 3 or greater enters, draw a card.

Each player chooses a creature they control. Destroy the rest.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

+1: Choose up to one target creature. Put a +1/+1 counter and a counter from among flying, first strike, lifelink, or vigilance on it.
−3: Look at the top seven cards of your library. You may put a permanent card with mana value 3 or less from among them onto the battlefield with a shield counter on it. Put the rest on the bottom of your library in a random order.
−7: Create five 3/3 white Angel creature tokens with flying.

Activated abilities of artifacts your opponents control can't be activated.
+1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.
−2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile. Put that card into your hand.

When Anti-Venom enters, if he was cast, return target creature card from your graveyard to the battlefield.
If damage would be dealt to Anti-Venom, prevent that damage and put that many +1/+1 counters on him.

Trample
: Permanents you control gain indestructible until end of turn.
, Exile this card from your graveyard: Permanents you control gain indestructible until end of turn.

Ward
Devour land 3 (As this creature enters, you may sacrifice any number of lands. It enters with three times that many +1/+1 counters on it.)
When this creature enters, look at the top X cards of your library, where X is this creature's power. Put any number of land cards from among them onto the battlefield tapped, then shuffle.

All Slivers have "When this permanent enters, you may fateseal 1." (To fateseal 1, its controller looks at the top card of an opponent's library, then they may put that card on the bottom of that library.)

: Add .
Channel — , Discard this card: It deals 4 damage to target attacking or blocking creature. This ability costs less to activate for each legendary creature you control.

Other Goblins you control get +1/+1.
Sacrifice a Goblin: Destroy target artifact.

(: Add .)

When Kaho enters, search your library for up to three instant cards, exile them, then shuffle.
, : You may cast a spell with mana value X from among cards exiled with Kaho without paying its mana cost.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Create two tapped Powerstone tokens.
II — Choose two target players. Until your next turn, each creature they control attacks the other chosen player each combat if able.
III — This Saga deals X damage to any target and X damage to any other target, where X is the number of artifacts you control.