If you want to throw real money at Arena , you can buy gems, which are spent to buy larger numbers of booster packs at once, but all you really get for your cash is immediacy and convenience
10 Murderous Cut Chop Chop Instant speed removal is great in any format, and a one mana spell that can take out any creature is even better, though Murderous Cut does have a small stipulation: it costs six mana
In blue, Mockingbird is a flexible card that retains its Bird type even if you copy a Creature
It can be clunky, but as far as capabilities among relentless cards, it is the best
These were excellent ways to fix your mana in a pinch, and unlike the Karoo lands, they dont require you returning an untapped land
This deck does have some interesting pieces in its four planeswalkers, and Into the Pit is a fascinating enchantment that Id argue deserves a spot in any graveyard recursion deck