mtg boros card sleeves Strike-Captain - Ravnica: Clue Edition Have you ever held a Boros signet Boros Charm Alter Sleeves— SWIPE

The power level of these cards simply dont measure up to the blue ones, so these cards will benefit more in a game of EDH then a game of 1v1

[151] Whereas Secret Lair sets may only consist of a few cards that may be unplayable under normal rules, Universes Beyond sets include dozens of cards, including Commander decks and booster packs, and their cards are play-legal and often usable in most Magic gameplay formats

And they start with three mana and that is only one card, most are 4+ mana

(From WOTC) At the beginning of the game (after mulligans have been taken), the starting player turns the top card of the planar deck face up and its effects become present in the game

Since Skystrike Officer's activated ability doesn't have a tap symbol in its cost, you can tap creatures that haven't been under your control since your most recent turn began (including Skystrike Officer itself if you'd like) to pay the cost