Ikoria: Cryptids: Mechanics

Sighting: You may summon this creature for its Sighting cost. If you do, shuffle it from the battlefield into its owner's deck at the beginning of the next end step. Used on 7 cards: Jungle Razorspine, Snatching Fiend, Avalanche Yeti, Luminous Unicorn, Prismatic Devourer, Deepgrowth Stickbug, Hermetic Hellmaw

Sightning allows you to play creatures at an alternate (usually cheaper) cost, with the caveat that they return to the deck at the end of the turn. These creatures will usually have effects that trigger on ETB, or some other reason you might want to play them multiple times. Similar to Dash.

Crystalize: Create a 0/0 colorless Crystal creature token. Then, you may move any number of counters from creatures you control to it. Used on 7 cards: Gemfeather Raptor, Gemhorn Stag, Gemstinger Scorpion, Gemskin Baloth, Gemtooth Howler, Opulent Coalescence, Scintillating Scales

In card text or details pages, write the mechanic's code name (playtest name) between square brackets, like "[Crittercast]", "[Bushido 1]" or "[Delay 4 {2}{R}{R}]". It will be expanded to the mechanic's name plus reminder text, such as "Suspend 4 – {2} {r} {r} . (Rather than cast this spell from your hand,...)"
To expand a mechanic's name but not its reminder text, include parentheses at the end of the square brackets: "[Crittercast()]", "[Delay 9 {R}()]".