avacyn card sleeves Premium 66x91mm in size x100 Count Sleeves Acid Free Avacyn, Angel of Hope ANGEL

Lists are subjective, so be sure to leave a comment if you disagree with any of my picks

RCCC Flame Pillar 60 You may discard a [R] Energy card attached to Charizard

Archfiend, now bolstered by the power of Ritual Summoning, has also received a major boost

Otherwise, I use normal penny sleeves for binders of cheap or played cards

Also there are cards that have different font used (Candelabra of Tawnos, Tarmogoyf MM) or different spacing and leading (Flooded Strand) which should give away the cards at first glance

Another common situation when splashing is opening a hand with your splash card, but no mana to cast it