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While this is slow in the modern game, Infernity Avenger is still rather useful, as you can trigger it on your turn by crashing a Monster into the opponent

(2) If you can make payment after purchase, silent purchase and immediate purchase are OK

presumably those crushed metal debris are the remains of the many scissors lizards that the Rock Lobster has murdered

Amassing a new creature type on top of an existing army adds that creature type to the army

This is well-represented by Chaos Orb, which ultimately was banned because resolving its effect was simply impractical

The biggest hitter here, to use the term incredibly loosely, is Reliquary Tower