Note that we still restricted ourselves to cycling cost involving mana
If the first card was not a land, the probability rises to 24/59 = 40.7%
Thats because it acts like a mini-Reliquary Tower with the option to keep ten cards in your hand, plus you can draw the difference
Each portfolio can hold up to 64 standard-sized cards and 8 oversized cards.
Five mana is a lot, but Ygra already sees play in the deck at the same cost so its not totally out of the question
Dogmeat, Ever Loyal Interceptor, Shadow's Hound Isamaru, Hound of Konda K-9, Mark I Karvanista, Loyal Lupari Kroxa and Kunoros Kunoros, Hound of Athreos Lockjaw, Slobbering Teleporter Lucky the Pizza Dog Mowu, Loyal Companion Pako, Arcane Retriever Phelia, Exuberant Shepherd Rex, Cyber-Hound Rin and Seri, Inseparable Tesak, Judith's Hellhound Yoshimaru, Ever Faithful