On MTG Arena, there are wildcards of different rarity levels you can cash in for cards of the same rarity
For now, we have Emiel the Blessed as the main unicorn payoff, and Blessed Sanctuary as a non-creature spell that can creature unicorn tokens
Haunted Dead Much like Haunt of the Dead Marshes, Haunted Dead suffers from a hefty cost on its recusion ability
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I think you can drop these: Impact Tremors: I get it works with a combo but I feel like there are better cards to use Fable of the Mirror-Breaker Flip : a pretty good card, it could fit in here, but you may need to run more reanimating cards, I don't feel it exactly fits too much with the goblin token and the mini-kiki Pitiless Plunderer: excels in decks with lots of creature sacs but I don't see as much in this list, I feel at a glance, that it is more of a dead card more often than not
MEGA era boxes start at ~$53, the 30th anniversary is months away, and entry points exist across every budget level