It can't block, which isn't unusual for this sort of creature, but its recursion ability is limited by the raid mechanic
Players coming in from other trading card games might forget that Magic: The Gathering has a whole second main phase after combat during which you can play sorceries and permanents, as well as activate all of those abilities that say "activate only as a sorcery." Even if you don't have a Wrath of God to wipe out your opponent's board post-attack, there are still a lot of things you can do, and the raid mechanic serves not only to remind you that there's a second main phase, but also encourages you to attack
Lord Xander, the Collector is a seven-mana Blue, Black and Red 6/6 vampire demon noble who is going to ruin a lot of Commander games
Deadpool is not considered to have mutated, so if you mutate onto Deadpool at this point, it's the first time that Deadpool has mutated, not the second time, so the Starrix trigger only puts one permanent onto the battlefield
A great example is Parallax Tide, a card that hasn't seen any kind of play since its Standard days yet managed to break Premodern wide open
For example, take Unwind: This "no mana" mechanic that debuted in Urza's Block came to dominate every tournament from Vintage and Legacy to Pauper, and has been used abusively to make mana with cards like High Tide or the Urzatron, as well as to rack up lethal storm counts
