2 cards where the text includes “+1/+1” and the text includes “counter” and the colors is GU and it’s legal in Standard

Slogurk, the Overslime {1}{G}{U}
Legendary Creature — Ooze
Trample
Whenever a land card is put into your graveyard from anywhere, put a +1/+1 counter on Slogurk, the Overslime.
Remove three +1/+1 counters from Slogurk: Return it to its owner’s hand.
When Slogurk leaves the battlefield, return up to three target land cards from your graveyard to your hand.
Illustrated by Nicholas Gregory
- Standard
- Legal
- Alchemy
- Legal
- Pioneer
- Legal
- Explorer
- Legal
- Modern
- Legal
- Brawl
- Legal
- Legacy
- Legal
- Historic
- Legal
- Vintage
- Legal
- Pauper
- Not Legal
- Commander
- Legal
- Penny
- Not Legal

Winterthorn Blessing {G}{U}
Sorcery
Put a +1/+1 counter on up to one target creature you control. Tap up to one target creature you don’t control, and that creature doesn’t untap during its controller’s next untap step.
Flashback {1}{G}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Illustrated by Yeong-Hao Han
- Standard
- Legal
- Alchemy
- Legal
- Pioneer
- Legal
- Explorer
- Legal
- Modern
- Legal
- Brawl
- Legal
- Legacy
- Legal
- Historic
- Legal
- Vintage
- Legal
- Pauper
- Not Legal
- Commander
- Legal
- Penny
- Not Legal
The message was clear to Sorin—time to search for something else.