Lord Skitter, Sewer King (PRE-97S) - Wilds of Eldraine Promos Foil Number_OP09-002 What are these strange symbols

What are these strange symbols on the map

the set includes creatures like vampires

[Once Per Turn] If this Character would leave the field

In conjunction with a simple flowchart

10x (+5/5 flips to +10/10)

Lord Skitter, Sewer King (PRE-97S) - Wilds of Eldraine Promos Foil Number_OP09-002 What are these strange symbolsCasting Cost Card TypeLegendary Creature Rat Noble RarityRare ArtistJesper Ejsing Power Toughness3 3 Legalities LEGAL Standard LEGAL Future LEGAL Historic LEGAL Timeless LEGAL Gladiator LEGAL Pioneer LEGAL Explorer LEGAL Modern LEGAL Legacy NOT LEGAL Pauper LEGAL Vintage LEGAL Penny LEGAL Commander LEGAL Oathbreaker LEGAL Standardbrawl LEGAL Brawl LEGAL Alchemy NOT LEGAL Pauper Commander LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL