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The enemy-color legendary creatures from Invent Superiority and Entropic Uprising give us four different partner configurations that are also Four-Color Not Black

On that note, pump and other forms of protection spells are among the most significant reasons to plot a Slickshot Show-Off

Orthion, Hero of Lavabrink is practically made for Deadpool, Trading Card

You blink any number of non-lands you control, not just creatures, so Ichor Wellspring in artifacts, Mulldrifter in creatures, or Flight of Fancy in enchantments will all work

We have Bleachbone Verge, Riverpyre Verge, Sunbillow Verge, Wastewood Verge, and Willowrush Verge, and they're all preselling for $7-$8

That said, the planeswalkers given the critter treatment are certainly more interesting than the non-species swapped cards, so that might help keep the price propped up