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So, almost every creature you ramp out will net you an extra card, often for no mana

"When you cast a spell with convoke, tap your army to make it cheapereach creature pays either or one mana of its color." Official Rules Reference From the Magic: The Gathering Comprehensive Rules Section 702.51 702.51 Convoke KEYWORD ABILITY Official rule text from the Magic: The Gathering Comprehensive Rules document

As a member of the Kouzuki Clan, this Hiyori is searchable by all the Wano support from previous sets and allows you to draw a card, making it ideal for EB-01 Kouzuki Oden

[18] Some rare cards can also be found on Amazon