
Gogo, Master of Mimicry | Legendary Creature | Wizard | {X}{X}, {T}: Copy target activated or triggered ability you control X times. You may choose new targets for the copies. This ability can't be copied and X can't be 0. (Mana abilities can't be targeted.) | Thea Dumitriu

Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel | Legendary Creature // Legendary Creature | Human Avatar Soldier // Angel Nightmare Avatar | Whenever Sephiroth enters or attacks, you may sacrifice another creature. If you do, draw a card.
Whenever another creature dies, target opponent loses 1 life and you gain 1 life. If this is the fourth time this ability has resolved this turn, transform Sephiroth. // Flying
Super Nova — As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with "Whenever a creature dies, target opponent loses 1 life and you gain 1 life."
Whenever Sephiroth attacks, you may sacrifice any number of other creatures. If you do, draw that many cards. | Wisnu Tan

Traveling Chocobo | Creature | Bird | You may look at the top card of your library any time.
You may play lands and cast Bird spells from the top of your library.
If a land or Bird you control entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time. | Ashley Mackenzie

Lightning, Army of One | Legendary Creature | Human Soldier | First strike, trample, lifelink
Stagger — Whenever Lightning deals combat damage to a player, until your next turn, if a source would deal damage to that player or a permanent that player controls, it deals double that damage instead. | Shiyu

Emet-Selch, Unsundered // Hades, Sorcerer of Eld | Legendary Creature // Legendary Creature | Elder Wizard // Avatar | Vigilance
Whenever Emet-Selch enters or attacks, draw a card, then discard a card.
At the beginning of your upkeep, if there are fourteen or more cards in your graveyard, you may transform Emet-Selch. // Vigilance
Echo of the Lost — During your turn, you may play cards from your graveyard.
If a card or token would be put into your graveyard from anywhere, exile it instead. | Néstor Ossandón Leal

Vivi Ornitier | Legendary Creature | Wizard | {0}: Add X mana in any combination of {U} and/or {R}, where X is Vivi Ornitier's power. Activate only during your turn and only once each turn.
Whenever you cast a noncreature spell, put a +1/+1 counter on Vivi Ornitier and it deals 1 damage to each opponent. | Toni Infante

Terra, Magical Adept // Esper Terra | Legendary Creature // Legendary Enchantment Creature | Human Wizard Warrior // Saga Wizard | When Terra enters, mill five cards. Put up to one enchantment card milled this way into your hand.
Trance — {4}{R}{G}, {T}: Exile Terra, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery. // (As this Saga enters and after your draw step, add a lore counter.)
I, II, III — Create a token that's a copy of target nonlegendary enchantment you control. It gains haste. If it's a Saga, put up to three lore counters on it. Sacrifice it at the beginning of your next end step.
IV — Add {W}{W}, {U}{U}, {B}{B}, {R}{R}, and {G}{G}. Exile Esper Terra, then return it to the battlefield (front face up).
Flying | Clare Wong

Buster Sword | Artifact | Equipment | Equipped creature gets +3/+2.
Whenever equipped creature deals combat damage to a player, draw a card, then you may cast a spell from your hand with mana value less than or equal to that damage without paying its mana cost.
Equip {2} | Douzen