When casting Life//Death. Lands that don't have summoning sickness can't tap for mana. This happens to several types of lands.
The card Life//(Death is bugged. https://gatherer-static.wizards.com/Cards/medium/92CB5ACA597ECB007EF6D807D9EF1B1E82B5F8B06544B1A05E981E5D13F8B12D.webp
When cast. Some lands become summoning sick even though they shouldn't, because they came into play previous turns. I can't tap them for mana. This happens to several types of lands. My deck also runs the card Badgermole Cub, so it is possible there is an interraction bug between the cards, but i can't confirm. If not, the card LIFE//DEATH when you cast LIFE side of the card is bugged.
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