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Convoke only works when you cast convoke spells, and only to reduce the mana cost of the spell being cast

Ketramose, the New Dawn $2.15 $0.69 $3.78 $17.20 $7.25 $0.82 $10.54 $0.87 $2.78 $14.10 $5.12 $3.65 $2.72 $1.97 $0.40 $1.41 $2.20 $1.49 $0.56 $0.98 $0.86 $1.03 $4.97 $14.91 $1.02 $0.51 $6.29 $1.53 $4.01 $6.93 $1.39 $6.15 $19.60 $2.16 $2.52 $5.63 $2.69 $5.38 $4.40 $3.23 $2.47 $34.81 $1.98 $6.79 $2.88 $7.88 $3.34 $6.34 $2.20 $1.38 $5.51 $0.90 $4.03 $0.82 $15.63 $5.14 $5.28 $6.05 $9.86 $27.39 $12.02 $6.54 $1.13 $0.64 $0.49 $1.26 $18.48 $1.29 $6.24 $77.66 $1.97 $6.52 $1.72 $5.14 $8.62 $2.44 $13.35 $0.60 $12.35 $1.83 $0.89 $14.16 $0.83 $1.24

Outside of Limited, the card sees plenty of play in Standard as its able to offer so much value for little mana investment

By planning around it, you can win with it in a few turns or go from losing to winning, unlike most sweepers that take you from losing to medium states