Such cards should preferably do so by a significant margin, such as with "Griggle" and "Aegis of Gaia", or over a prolonged period of time, such as with "Solemn Wishes" and "Golden Ladybug", to keep the Continuous Effects of the "Aroma" monsters active
The trade-in for MTG Arena Historic wildcards is the same as any rare-equivalent card, 1:1
Dragonlord's Servant, Dragonspeaker Shaman, and The Ur-Dragon all discount Dragons by generic mana
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Because of that, it means the set is replete with more mechanics than Im willing to count, in much the same way a normal Core Set does, although a lot of those are flavour more than anything else, simply adding D&D skill names before specific card effects
To look at the cost-effectiveness of this card, you need to look at the disparity between Zombify and Saw in Half