If its your first time competing in a tournament, I would definitely double-check the legality of all your cards, but otherwise, take it easy
Being able to cheat absurdly expensive cards as long as you pay one mana of each color can be really good when youre playing expensive battlecruisers
Simply cast the combo, activate Sinkhole , skip your opponents turn, and if you happen to have Rescue , repeat the combo again
These defects can include missing, off-center, double, faded, or misplaced stamps
If a monster(s) is sent from the field to your opponent's GY: Place 1 Otoshidamashi Counter on this card, then Special Summon "Otoshidamashi Tokens" (Beast/EARTH/Level 1/ATK ?/DEF ?) up to the number of Otoshidamashi Counters on this card
The effect is interesting, too, even if I don't think it's particularly thematic