Ayesha Tanaka, Armorer {3}{W}{U}
Legendary Creature — Human Artificer
Whenever Ayesha Tanaka attacks, look at the top four cards of your library. You may put any number of artifact cards with mana value less than or equal to Ayesha Tanaka's power from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order.
Ayesha Tanaka can't be blocked as long as defending player controls three or more artifacts.
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Cards that do something similar expected a card that isn't here?
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Master Piandao 93%
$0.18#9253
"Whenever this card attacks, look at the top four cards of your library. You may reveal an Ally, Equipment, or Lesson card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Djeru and Hazoret 90%
$0.40#5176
"Whenever this card attacks, look at the top six cards of your library. You may exile a legendary creature card from among them. Put the rest on the bottom of your library in a random order. Until end of turn, you may cast the exiled card without paying its mana cost."
The Celestial Toymaker 88%
$30.39#16590
"Whenever this card attacks, look at the top three cards of your library. Exile any number of them in a face-down pile and the rest in a face-up pile. Defending player chooses one of those piles. Put that pile into your hand."
Ashe, Princess of Dalmasca 87%
$0.18#9773
"Whenever this card attacks, look at the top five cards of your library. You may reveal an artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."
Director Nick Fury 84%
$0.91#15611
"Whenever you attack, look at the top four cards of your library. You may reveal a Hero card from among them and put that card into your hand. Put the rest on the bottom of your library in a random order."
The Regalia 84%
$1.83#2712
"Whenever this card attacks, reveal cards from the top of your library until you reveal a land card. Put that card onto the battlefield tapped and the rest on the bottom of your library in a random order."
Cosmic Cube 82%
$14.75#9437
"Whenever you attack, look at the top six cards of your library. You may cast a spell from among them with mana value less than or equal to the greatest power among attacking creatures you control without paying its mana cost. Put the rest on the bottom of your library in a random order."
Sigarda, Champion of Light 80%
$0.76#11606
"Whenever this card attacks, if you control three or more creatures with different powers, look at the top five cards of your library. You may reveal a Human creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order."