Magus of the Vineyard 
Creature — Human Wizard
$4.47 #7361 0.54 19.3 years
At the beginning of each player's first main phase, that player adds 
.
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Cards similar to Magus of the Vineyard expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Eladamri's Vineyard97%
$2.32↓#78560.35↓28.9 years↑
"At the beginning of each player's first main phase, that player adds 
."
Blinkmoth Urn88%
$1.02↓#5825↑0.4722.9 years↑
"At the beginning of each player's first main phase, if this artifact is untapped, that player adds
for each artifact they control."
Shizuko, Caller of Autumn85%
$4.19↓#13769↓1.00↑21.6 years↑
"At the beginning of each player's upkeep, that player adds 

. Until end of turn, they don't lose this mana as steps and phases end."
Cheering Crowd82%
$0.30↓#12996↓0.39↓1.0 years↓
"At the beginning of each player's first main phase, that player may put a +1/+1 counter on this creature. If they do, they add
for each counter on it."
Glóin the Mighty // Easy Pickings80%
$0.29↓#10700↓0.00↓0.1 years↓
"At the beginning of your first main phase, add 
."
Tangleroot80%
$0.68↓#17215↓0.00↓22.9 years↑
"Whenever a player casts a creature spell, that player adds
."
Black Market78%
$4.98↑#674↑0.4726.9 years↑
"At the beginning of your first main phase, add
for each charge counter on this enchantment."