If a creature has multiple names, and each of the chosen letters is the first letter of one of its names, you'll put only one +1/+1 counter on it

Dragapult #91Holo Rare $0.61 Dragapult #SV62Shiny Holo Rare $2.71 Dragapult #130Holo Rare $0.30 Dragapult #89Holo Rare $0.25 Dragapult #6Promo $0.18 Dragapult #54Rare $0.42 Dragapult #51Rare $0.40 Dragapult #41Rare $2.02 Dragapult - 087/190 #87None $0.31 Dragapult - 091/192 #91Rare $0.44 Galar Power Mini Tin [Dragapult] $47.65 Knock Out Collection [Galarian Slowking, Galarian Obstagoon, and Dragapult] $32.49 League Battle Deck [Dragapult ex] $95.97 Hydreigon ex & Dragapult ex Premium Collection $84.10 Darkness Ablaze Premium Checklane Blister [Dragapult] $20.00 Shining Fates Premium Collection [Shiny Dragapult] $118.73 Celebrations Collection [Dragapult Prime] $76.27 Celebrations Collection Case [Dragapult Prime] $599.95 Pelipper #42Uncommon $0.03 Shuckle #5Uncommon $0.23 Cinderace VMAX #36Ultra Rare $2.94 Ninetales #25Rare $0.70 Flapple #22Holo Rare $0.63 Shinx #60Common $0.09 Milotic V #43Ultra Rare $3.46 Electivire #59Rare $0.29 Litwick #31Common $0.06 Grubbin #16Common $0.06

Based on the latest market prices tracked on TCG Stacked, Shifting Sliver is worth about $5.13 USD
You can dig for whatever you need at any given moment, and if youre running Ethans Typhlosion, you can power up those attacks once you get four in the discard pile
That has drawn it some interest in cEDH, but Im pretty sure more multicolor EDH decks have some interest in such a useful mana dork