One other strength of Iymrith is, in mulligan situations, keeping lands + Iymrith is a very real way to get back into the game
Casting Cost: Card Text: Undergrowth - Search your library for a black card with converted mana cost less than or equal to the number of creature cards in your graveyard, reveal it, put it into your hand, then shuffle your library
Add 1 card with [Garurumon] or [Omnimon] in its name and 1 [X Antibody] among them to your hand
This is amazing in formats with larger than 60 cards like Commander at 100 or Five Color where this is a powerhouse at a minimum of 300 cards
Since Magecraft cares about copied spells, Archmage Emeritus becomes an ally that can refill your hand in a couple of spells
or a Time Thief under the effect of Startup or if you used Bezel Ship's GY effect while Break Sword was on the field