Blue-Red Delver isnt a bad matchup per se, but it has definitely gotten worse now that Delvers creatures all have flying, and Murktide Regent in particular is an issue due to how quickly it can close out a game
In English, one such card is the 3rd Edition Serendib Efreet, which has the picture of Ifh-Biff Efreet from Arabian Nights instead
Being gamers we tend to love a lists
There was a perfect confluence of these things in Theros/Return to Ravnica Standard, with devotion, powerful one-drops like Thoughtseize, and lots of missing fixing prior to all ten Temples being released
Barrin, Master Wizard (Saga/Legacy/Destiny) Barrin, Master Wizard, though a very fragile 1/1, basically turned every card on your side of the board into an Unsummon
These cards reward you for playing more of the same creature type, but can also apply to any creature type