Mangara, the Diplomat 

Legendary Creature — Human Cleric
Lifelink
Whenever an opponent attacks with creatures, if two or more of those creatures are attacking you and/or planeswalkers you control, draw a card.
Whenever an opponent casts their second spell each turn, draw a card.
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Kraum, Ludevic's Opus 100%
#6811
"Whenever an opponent casts their second spell each turn, draw a card."
+1 more matching line
Hermit of the Natterknolls // Lone Wolf of the Natterknolls 96%
$0.29#11973
"Whenever an opponent casts a spell during your turn, draw a card."
Everett K. Ross, Hapless Attaché 94%
$0.59#18504
"Whenever an opponent attacks you with two or more creatures, draw a card."
Wavebreak Hippocamp 92%
$0.83#2329
"Whenever you cast your first spell during each opponent's turn, draw a card."
Ever-Watching Threshold 92%
$0.54#8790
"Whenever an opponent attacks, if they attacked you and/or a planeswalker you control, draw a card."
Rhystic Study 91%
$70.26#44
"Whenever an opponent casts a spell, you may draw a card unless that player pays {1}."
Ghostly Pilferer 91%
$3.49#1404
"Whenever an opponent casts a spell from anywhere other than their hand, draw a card."
Trouble in Pairs 89%
$28.59#630
"Whenever an opponent attacks you with two or more creatures, draws their second card each turn, or casts their second spell each turn, you draw a card."
+1 more matching line
Esper Sentinel 89%
$56.22#76
"Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is this creature's power."
Faerie Mastermind 86%
$10.74#317
"Whenever an opponent draws their second card each turn, you draw a card."
Mystic Remora 86%
$12.46#98
"Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}."
Aurelia, the Law Above 85%
$1.44#1747
"Whenever a player attacks with three or more creatures, you draw a card."
Jon Irenicus, Shattered One 85%
$0.33#7523
"Whenever a creature you own but don't control attacks, you draw a card."
Firemane Commando 84%
$0.96#1863
"Whenever another player attacks with two or more creatures, they draw a card if none of those creatures attacked you."
Iron Man, Modern Marvel 83%
$43.14#19470
"Whenever this card attacks, if you control another artifact creature, draw a card."
Tahngarth, First Mate 83%
$0.23#15357
"Whenever an opponent attacks with one or more creatures, if this card is tapped, you may have that opponent gain control of this card until end of combat. If you do, choose a player or planeswalker that opponent is attacking. this card is attacking that player or planeswalker."