Maekawa Yuichi

Tezzeret, Betrayer of Flesh

The first activated ability of an artifact you activate each turn costs {2} less to activate.
[+1]: Draw two cards. Then discard two cards unless you discard an artifact card.
[−2]: Target artifact becomes an artifact creature. If it isn't a Vehicle, it has base power and toughness 4/4.
[−6]: You get an emblem with "Whenever an artifact you control becomes tapped, draw a card."

Ugin, the Ineffable

Colorless spells you cast cost {2} less to cast.
[+1]: Exile the top card of your library face down and look at it. Create a 2/2 colorless Spirit creature token. When that token leaves the battlefield, put the exiled card into your hand.
[−3]: Destroy target permanent that's one or more colors.

Jaya, Venerated Firemage

If another red source you control would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead.
[−2]: Jaya, Venerated Firemage deals 2 damage to any target.