Four mana seems steep, but the added protection is well worth it when youre gearing up to close out the game
Entropic Uprising supports this heavily by running tons of Wheels (Runehorn Hellkite, Dragon Mage, Wheel of Fate, Windfall, Ancient Excavation, Whispering Madness) and then a bunch of ways to take advantage of all those discarded cards / filled graveyards with stuff that reward you for your opponents discarding (Nath of the Gilt-Leaf, Sangromancer, Waste Not) or for having filled graveyards (Guiltfeeder, Spellheart Chimera, Worm Harvest, Ghastly Conscription)
The cost reduction Jhoira's Familiar provides is good with legends, artifacts, sagas, and makes several loop combos viable like Mystic Forge + Sensei's Divining Top
Legendary builds are so diverse from Shrines to planeswalkers to legendary pals and historic matters
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UR Ultra Rare Red Blossoms from Underroot X DARK Level 1 [ FiendEffect ] ATK 0 DEF 0 If this card is in your hand: You can target 1 Spell/Trap in each GY