Added A Custom Tag

src/main/java/net/strangergamer/mccourse/block/custom/MagicBlock.java

@@ -4,6 +4,7 @@
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.item.TooltipFlag;
 import net.strangergamer.mccourse.item.ModItems;
+import net.strangergamer.mccourse.util.ModTags;
 import net.minecraft.core.BlockPos;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.sounds.SoundSource;
@@ -41,8 +42,7 @@ public void stepOn(Level pLevel, BlockPos pPos, BlockState pState, Entity pEntit
         super.stepOn(pLevel, pPos, pState, pEntity);
     }
     private boolean isValidItem(ItemStack item) {
-        return item.getItem() == ModItems.RAW_BLACK_OPAL.get()
-                || item.getItem() == Items.COAL || item.getItem() == Items.DANDELION;
+        return item.is(ModTags.Items.TRANSFORMABLE_ITEMS);
     }
     @Override
     public void appendHoverText(ItemStack pStack, Item.TooltipContext pContext, List<Component> pTootipComponents, TooltipFlag pTooltipFlag) {

src/main/java/net/strangergamer/mccourse/util/ModTags.java

@@ -0,0 +1,22 @@
+package net.strangergamer.mccourse.util;
+
+import net.strangergamer.mccourse.MCCourseMod;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.tags.BlockTags;
+import net.minecraft.tags.ItemTags;
+import net.minecraft.tags.TagKey;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.level.block.Block;
+public class ModTags {
+    public static class Blocks {
+        private static TagKey<Block> createTag(String name) {
+            return BlockTags.create(ResourceLocation.fromNamespaceAndPath(MCCourseMod.MOD_ID, name));
+        }
+    }
+    public static class Items {
+        public static final TagKey<Item> TRANSFORMABLE_ITEMS = createTag("transformable_items");
+        private static TagKey<Item> createTag(String name) {
+            return ItemTags.create(ResourceLocation.fromNamespaceAndPath(MCCourseMod.MOD_ID, name));
+        }
+    }
+}

src/main/resources/data/minecraft/tags/item/transformable_items.json

@@ -0,0 +1,8 @@
+{
+  "values": [
+    "mccourse:raw_black_opal",
+    "minecraft:coal",
+    "minecraft:dandelion",
+    "minecraft:compass"
+  ]
+}