An everyday common rarely earns back its grading cost, whereas a clean, scarce card can return many times the outlay
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control is a defining matchup of Guilds of Ravnica Standard
To have a permanent connive N, the permanents controller draws N cards, discards N cards, then puts a number of +1/+1 counters on the permanent equal to the number of nonland cards discarded this way
Agathas Soul Cauldron Targeted graveyard removal every turn for an initial cost of two is already extremely useful, and thats just the start of what Agatha can cook up with this cauldron
The card drawing effect is NOT a once per turn effect (unlike the topdeck manipulation effect), so you must keep drawing cards if your opponent's monsters keep getting destroyed