Core Set 2021

Basri Ket
Planeswalkers are very powerful, and their inclusion into a cubelet needs to take very seriously in order to promote healthy game play. That said, this is a pretty safe card to consider. To make the most of this walker, you will need to be on the aggressive side, which it then becomes difficult to defend against multiple players. The emblem, should you obtain it, will end the game, but if you played your cards right, you should be in a "win more" situation.

Basri's Lieutenant
Protection from multicolor is strong in a cubelet. Having some resilience to board wipes is also a bonus. Are the two together too strong when you have cards than can exile this?

Jeskai Elder
If Looter Il-Kor is too strong or annoying, might I suggest a Granny with prowess?

Sublime Epiphany
Too many options, but at six mana, is that a bad thing?

Teferi, Master of Time
Let's talk about Teferi. Any player's turn is bonkers in multiplayer and very strong in 1v1. You have to have very well balance cubelet to support this power, or you have to be doing lots of broken things where this card seems normal.

Demonic Embrace
Having a shared graveyard makes this card interesting and having to pay three life will help progress the game. Passing this around is not the end of the world if that is a subgame that wants to be played.

Eliminate
There are better removal spells in a Legacy cubelet, but this is a fine inclusion for a Peasant cubelet.

Hooded Blightfang
There are a few deathtouch creatures, so getting extra triggers is possible. The important part is putting pressure on planeswalkers if you are putting them into your cubelet.

Liliana, Waker of the the Dead
Similar to Teferi, Liliana in multiplayer is very powerful and her ultimate with a shared graveyard is just incredible. Take caution when trying to include this card.

Liliana's Standard Bearer
A "got you" card against the board wipes in the cublet. It's a fair card. A good card? Maybe.

Village Rites
A one-time skull clamp is hilariously fair in whatever cubelet you decide to build.

Garruk, Unleashed
Similar to Basri, this is an okay card. If your playgroup has the "no tutor" rule, then this card fails at it's ultimate.

Garruk's Harbinger
This is a strong creature card while having several options for removal.

Jolrael, Mwonvuli Recluse
Drawing additional cards is a staple of the cubelet, but I don't see Jolrael running away with a game. Her ability is strong but it is so easy to remove her before it becomes an issue.

Sporeweb Weaver
Slows down the aggro game, but it having reach can be very relevant an appealing for the inclusion.