Rather than give you some advice for problems you may or may not have, I am going to assume my experience is not universal in fact, and just tell everyone some things that have helped ME handle the most brutal 75% of all - the 75% of the game when it's not your turn - and that's if you're lucky
Queen Allenal of Ruadach Queen Allenal of Ruadach has an ability typical of green and white creatures, reminiscent of Wayfaring Temple and Adeline, Resplendent Cathar
I run Rift in every blue deck due to its modality, and generally only run Rebuke in my ramp decks
This Grixis card is a 4-CMC 4/4 creature with firebending 2 and the ability to let you copy any spells you cast while Fire Lord Azula is attacking
Both the Alcove Edge and Alcove Flip are built to accommodate standard size cards, making them compatible with Commander, Magic, and other trading card games