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The trees in the background then look like Emerald symbol, a common trait in cards

And if you flash it back later

I dont expect any of these to matter in competitive Constructed formats, so they really come down to how useful they are in Draft, Sealed, and EDH

Because Ukkima wants to enter and leave the battlefield we have a number of ways to flicker creatures with cards like Planar Incision and Teferis Time Twist or scam creatures with cards like Feign Death and Undying Malice, and we can use those on Deepglow Skate as well

Tifa's last ability cares about the power of each individual creature that dealt combat damage to a player, not their total power