The first is a creature or spell that's expensive, but has a very cheap suspend cost that forces players to wait a few turns
Being able to play whatever you want without worrying about the cost, or plumbing all that mana into an obscenely massive X-cost spell, can devastate the board
BT20-082 SR Digimon Lv [Counter] Blast Digivolve Piercing Vortex Blocker [All Turns] [Once Per Turn] When any Digimon suspend, this Digimon may unsuspend
Solgaleo 133 Pikipek Colorless 50 Peck (20) Both 134 Trumbeak Colorless 80 Glide (30) Both 135 Toucannon Colorless 140 Drill Peck (70) Both 136 Yungoos Colorless 60 Tackle (20) Solgaleo 137 Gumshoos Colorless 100 Headbang (50) Solgaleo 138 Stufful Colorless 70 Hammer In (60) Lunala 139 Bewear Colorless 130 Tantrum (130) This Pokmon is now Confused
Zone-change triggered abilities that care about the new color (like "when a [color] permanent enters" or "when you cast a [color] spell") will work because those effects apply after the card is already in its new zone
Sedgemoor Witch is a constructed-focused card which means it may not see much play in Commander, but could be a good option for sacrifice strategies in constructed formats