Mage of Tazeem Tides - 1U
Creature - Merfolk Wizard
Kicker (4)
When CARDNAME enters the battlefield, if it was kicked, return target instant or sorcery card from your graveyard to your hand.
2/1
Sky Dancer of Nimana - 2B
Creature - Human Rogue
Flash
Flying
When CARDNAME enters the battlefield, target opponent mills two cards.
2/1
Celebratory Kor - 2W
Creature - Kor Cleric
Whenever CARDNAME or another creature enters the battlefield under your control, you gain 1 life.
1/4
This is similar to the dash mechanic.
No "your opponent controls" restriction, and it's mandatory, as a heads up.
Interesting design.
It looks at "amount of mana spent to cast it" rather than X due to Commander. Surprised to see another card that copies permanent spells.