Even though Thalia taxes noncreature spells by one mana, all this card cares about is the number of colors used to cast it
Some cards have moved up or down on the list compared to where they were on the instants and card-drawing list
The ever-looming threat of Gargos, an 8/7 creature, fighting an enemy creature is enough to put off many opponents from targeting your growing army of Hydras
Obviously, if you can cast Atraxa, youre going to get a massive, formidable creature that also draws you something like 3 or 4 cards
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Once you get into the wider use items like dice, bags, though, you should start looking at the 2- and 4-star reviews instead of the 1- or 5-star ones, as they tend to be from actual users