Cards like Illvoi Operative

Thunder Drake100%

$0.10↓#211330.067.5 years↑

"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Monk of the Open Hand95%

$0.18↑#177270.005.2 years↑

"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Kraum, Violent Cacophony94%

$0.20↑#9301↑0.73↑2.5 years↑

"Whenever you cast your second spell each turn, put a +1/+1 counter on this card and draw a card."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Sunstar Lightsmith94%

$0.23↑#14439↑0.38↑1.2 years

"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature and draw a card."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Infernal Pet92%

$0.11#26247↓0.005.7 years↑

"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature and it gains flying until end of turn."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Razzle-Dazzler92%

$0.06↓#15210↑0.062.5 years↑

"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. It can't be blocked this turn."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Effortless Master92%

$0.07↓#224740.001.5 years

"This creature enters with two +1/+1 counters on it if you've cast two or more spells this turn."

second-spell-matters, gains-pp-counters

Bloodsky Berserker90%

$0.22↑#24691↓0.005.7 years↑

"Whenever you cast your second spell each turn, put two +1/+1 counters on this creature. It gains menace until end of turn."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Poised Practitioner90%

$0.15↑#189350.33↑1.5 years

"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. Scry 1."

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Jeskai Devotee86%

$0.12↑#227470.001.5 years

"Whenever you cast your second spell each turn, this creature gets +1/+1 until end of turn."

second-spell-matters, cast-trigger-you, cast-trigger

Incursion Specialist86%

$0.12↑#28376↓0.0613.7 years↑

"Whenever you cast your second spell each turn, this creature gets +2/+0 until end of turn and can't be blocked this turn."

second-spell-matters, cast-trigger-you, cast-trigger

Cosmogrand Zenith86%

$6.27↑#3171↑0.31↑1.2 years

"Whenever you cast your second spell each turn, choose one —"

second-spell-matters, cast-trigger-you, repeatable-pp-counters

Codespell Cleric86%

$0.12↑#24183↓0.005.7 years↑

"When this creature enters, if it was the second spell you cast this turn, put a +1/+1 counter on target creature."

second-spell-matters, gains-pp-counters

Jori En, Ruin Diver85%

$0.53↑#4824↑0.0310.7 years↑

"Whenever you cast your second spell each turn, draw a card."

second-spell-matters, cast-trigger-you, cast-trigger

Brightspear Zealot85%

$0.11#25611↓0.071.2 years

"This creature gets +2/+0 as long as you've cast two or more spells this turn."

second-spell-matters

Clarion Spirit82%

$0.19↑#7149↑0.17↑5.7 years↑

"Whenever you cast your second spell each turn, create a 1/1 white Spirit creature token with flying."

second-spell-matters, cast-trigger-you, cast-trigger

Doomskar Oracle82%

$0.17↑#195610.005.7 years↑

"Whenever you cast your second spell each turn, you gain 2 life."

second-spell-matters, cast-trigger-you, cast-trigger

Satyr Hoplite81%

$0.13↑#212510.0712.5 years↑

"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature."

cast-trigger-you, repeatable-pp-counters, gains-pp-counters

Setessan Oathsworn81%

$0.16↑#23889↓0.11↑12.7 years↑

"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."

cast-trigger-you, repeatable-pp-counters, gains-pp-counters

Pheres-Band Thunderhoof81%

$0.13↑#29546↓0.0712.5 years↑

"Whenever you cast a spell that targets this creature, put two +1/+1 counters on this creature."

cast-trigger-you, repeatable-pp-counters, gains-pp-counters

Illvoi Operative

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