They're very often aggressively priced (a 0/3 for 1 mana can Block a lot of early Attackers and survive) They often have powerful abilities (consider something like Wall of Reverence, which is a 1/6 Flying Defender Creature for which gains you life equal to the Power of target Creature you control
Although known for being a thorn in an opponent's side, Rhystic Study's abilities are much more manageable and balanced in Wilds of Eldraine's draft environment with the heavy focus on enchantment interaction
Making splashy cards like Alrund's EpiphanyAlrund's Epiphany and Tlincalli HunterTlincalli Hunter cheaper by two mana can really accelerate your game plan and make opponents regret not removing this deceptively dangerous two-drop when they had the chance
If a spell that has X in its casting cost, X is unfortunately always equal to 0 when you cast the card from your library
However, despite being an expensive balbi creature with 4 colors and 4 mana, it did not have the ability to turn the game around, so it was not used in competitive formats
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