Illeider, Knowledge Gatherer

Whenever Illeider, Knowledge gatherer attacks,
reveal the top card of defending players library.
If that cards converted mana cost is equal to or less
than the number of clue tokens you control,
you may cast it without paying its mana cost.

Whenever Illeider, Knowledge gatherer deals combat damage to a player, investigate that many times. (To investigate, create a Clue token. It’s an artifact with
" {2}, Sacrifice this artifact: Draw a card.”)