If Ulamog's Crusher can't attack for any reason (such as becoming tapped or having just entered the battlefield), then it doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either.
Annihilator abilities trigger and resolve during the declare attackers step. The defending player chooses and sacrifices the required number of permanents before they declare blockers. Any creatures sacrificed this way won't be able to block.
If a creature with annihilator is attacking a planeswalker, and the defending player chooses to sacrifice that planeswalker, the attacking creature continues to attack. It may be blocked. If it isn't blocked, it simply won't deal combat damage to anything.
Last observed on Scryfall 2 months ago at $0.47. Over the trailing 90 days the price moved between $0.03 and $0.47 across 44 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from MM2 — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #7 of *Modern Masters 2015*, the set that shipped alongside the May 2015 Modern Masters 2015 release.
Card type: Creature — Eldrazi, printed at common. Commons fill the bulk of a booster pack's volume. Mana cost: {8} (8 converted). Keyword abilities: Annihilator.
Legal in Modern, Legacy, Vintage, Commander, and Pauper.
EDHrec ranks this card #3,205 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Todd Lockwood. Rarix catalogs 404 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Todd Lockwood
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
