Good news! The early MTG Arena Anthology spoilers look incredible! On July 20, Wizards of the Coast spoiled three new cards for the Historic and the Explorer Anthologies scheduled to release sometime this summer! All the Explorer cards are meta contenders that should help to bring Explorer up to speed with Pioneer, and the Historic cards are just as powerful as MTG Arena promised.
Supreme Verdict

Most of the UW control archetype, debatably the best deck in Pioneer right now, is already available in Explorer.
Supreme Verdict

Destroy all creatures.
was one of the larger pieces that was missing. With its inclusion, tempo decks that rely on counterspells (like Spirits and Flash) will have a much more difficult time keeping up. UW Control stands to have a massive presence in Explorer with the inclusion of Supreme Verdict.
If you think Supreme Verdict will only impact Explorer, that is likely the tip of the Iceberg. Supreme Verdict also stands to have a significant Historic impact, as UW control will want access to it in every format.
Arclight Phoenix

At the beginning of combat on your turn, if you've cast three or more instant and sorcery spells this turn, return this card from your graveyard to the battlefield.
has a much more substantial presence in Historic, so board wipes like
Anger of the Gods

Favored Hoplite

Boros Heroic decks have been making a statement in Pioneer. Favored Hoplite is one of the premier one-drops in this deck, and its inclusion will help to bring Heroic decks in line with its Pioneer iteration. Besides
Monastery Swiftspear

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
and some other flex slots, all Pioneer Heroic cards will be available in Explorer. Some crucial Sideboard cards are missing, like
Fiendslayer Paladin

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
This creature can't be the target of black or red spells your opponents control.
, but this brings Heroic much closer. Fiendslayer Paladin is significant in Explorer, as the following spoiler will power up one of Heroic’s worst matchups. It is important to note that Heroic decks in Pioneer are gravitating away from Fiendslayer Paladin, but Rakdos also stands to be a lot more popular in Explorer.
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Kalitas, Traitor of Ghet

Rakdos Midrange is another archetype that’s almost complete with the cards available on MTG Arena.
Kalitas, Traitor of Ghet

If a nontoken creature an opponent controls would die, instead exile that card and create a 2/2 black Zombie creature token.
{2}{B}, Sacrifice another Vampire or Zombie: Put two +1/+1 counters on Kalitas.
is the biggest card in the archetype that was missing, and this card is incredibly powerful. There’s a strong chance that Kalitas will give rise to multiple other archetypes in Explorer, like Vampire Aggro and Dimir Midrange/Control shells. This card has a significant impact in Pioneer and stands to have an even bigger Explorer impact in the short term. Depending on the meta changes in Historic, Kalitas also has a strong chance of impacting it.
Tarmogoyf

Of all the cards spoiled, this is the most shocking. Tarmogoyf has a long and rich competitive MTG history. It has historically been the chase card that players dreamed of opening in packs and has some of the most critical stories in MTG history based around it. Due to power creep,
Tarmogoyf

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Avacyn, Angel of Hope

Avacyn is a go-to-bomb in MTG. She doesn’t have a competitive presence due to her mana value, but she is a menace in Commander. This could be a new inclusion in
Indomitable Creativity

Go-Shintai of Life’s Origin

Go-Shintai of Life’s Origin is only legal in Eternal paper formats. As a result, this card has seen no play outside of Commander. This is the most puzzling of the inclusions for these Anthology releases. This card will likely see some testing, but I’m not sure if it will see play. If a Shrine deck becomes viable in Historic, it will be an unexpected (but very welcome) surprise! The most likely home for our new Shrine will be in Historic Brawl, MTG Arena’s version of Commander.
There’s More MTG Anthology Spoilers to Come!
This is only the beginning of the upcoming Anthology Spoilers for MTG Arena. These were a great start and will hopefully excite players to see what’s next. As long as the quality of cards that follow match these, MTG Arena’s non-rotating formats may have a resurgence.